The real time version of the XanMod Linux Kernel based on the latest Linux Kernel 5.13.1 is now available. XanMod is a general-purpose Linux kernel distribution with custom settings and new features. The real-time version is recommended for critical runtime applications such as Linux gaming eSports, streaming, live productions and ultra-low latency enthusiasts.

XanMod is a general-purpose Linux kernel distribution with custom settings and new features. Built to provide a stable, responsive and smooth desktop experience.

The real-time version is recommended for critical runtime applications such as Linux gaming eSports, streaming, live productions and ultra-low latency enthusiasts.

Supports all recent 64-bit versions of Debian and Ubuntu-based systems.

Main Features

• Preemptive Full Tickless Kernel at 500Hz w/ Tuned CPU Core Scheduler.
• RCU Boost for better responsiveness and lower overall system latency.
• Block Layer w/ multi-threaded runqueue for high I/O throughput.
• Caching, Virtual Memory Manager and CPUFreq Governor improvements.
• BBR TCP Congestion Control + FQ-PIE Packet Scheduling and AQM Algorithm [5.8].
• ORC Unwinder for Kernel Stack Traces (debuginfo) implementation.
• Third-party patchset available: ZSTD kernel, initrd and modules support [5.8][5.6-rt], Full x86_64 FSGSBASE instructions [5.8], Clear Linux [partial], CK's Hrtimer Patchset [5.8][5.4], Wine / Proton Fsync, PCIe ACS Override, BMQ Process Scheduler [5.4 stock disabled], Aufs [5.4] and GCC graysky's.
• Real-time Linux kernel (PREEMPT_RT) build available [5.6-rt][5.4-rt].
• Generic kernel package for compatibility with most Debian & Ubuntu based distributions. Built on the latest GCC 10.2 and Binutils 2.35.
• GPLv2 license. Can be built for any distribution or purpose.

Install via Terminal

echo 'deb  http://deb.xanmod.org releases main' | sudo tee /etc/apt/sources.list.d/xanmod-kernel.list && wget -qO -  https://dl.xanmod.org/gpg.key | sudo apt-key add -

Then update and install:

sudo apt update && sudo apt install linux-xanmod

Reboot.

Meta packages available: linux-xanmod, linux-xanmod-edge, linux-xanmod-lts, linux-xanmod-rt-edge and linux-xanmod-rt.

To try without adding the repository

Download from Sourceforge and install:
https://sourceforge.net/projects/xanmod/files/

1. In terminal:

   sudo dpkg -i linux-image-*xanmod*.deb linux-headers-*xanmod*.deb

2. Reboot.

• Check it:

  cat /proc/version

* linux-firmware-image package is optional

Linux 5.13.1-rt1-xanmod1

• 4beda54 Linux 5.13.1-rt1-xanmod1
• e9d81aa Merge tag 'v5.13-rt1' into 5.13
• 7e175e6 Add localversion for -RT release
• 6f3f622 POWERPC: Allow to enable RT
• 646e1ac powerpc: Avoid recursive header includes
• a1a11e9 powerpc/stackprotector: work around stack-guard init from atomic
• f35ef21 powerpc/kvm: Disable in-kernel MPIC emulation for PREEMPT_RT
• d91a27c powerpc/pseries/iommu: Use a locallock instead local_irq_save()
• 9d22762 powerpc: traps: Use PREEMPT_RT
• dd5ac56 ARM64: Allow to enable RT
• fb140d3 ARM: Allow to enable RT
• 2b7f161 arm64: fpsimd: Delay freeing memory in fpsimd_flush_thread()
• b7f7c9d KVM: arm/arm64: downgrade preempt_disable()d region to migrate_disable()
• ae21940 ARM: enable irq in translation/section permission fault handlers
• 184bec3 arch/arm64: Add lazy preempt support
• 2f9ba40 powerpc: Add support for lazy preemption
• 95e0021 arm: Add support for lazy preemption
• f2f9e49 x86: Support for lazy preemption
• 5edd169 x86/entry: Use should_resched() in idtentry_exit_cond_resched()
• 2d1c363 sched: Add support for lazy preemption
• 4d50732 x86: Enable RT also on 32bit
• 9e6ddcc x86: Allow to enable RT
• 60e58fe x86: kvm Require const tsc for RT
• 0cf7fc6 signal/x86: Delay calling signals in atomic
• a60399b sysfs: Add /sys/kernel/realtime entry
• 2e2c38e tpm_tis: fix stall after iowrite*()s
• cf64608 tty/serial/pl011: Make the locking work on RT
• b42b6e6 tty/serial/omap: Make the locking RT aware
• f5faab2 drm/i915/gt: Only disable interrupts for the timeline lock on !force-threaded
• 872271c drm/i915: skip DRM_I915_LOW_LEVEL_TRACEPOINTS with NOTRACE
• 4cad323 drm/i915: disable tracing on -RT
• a2a18b7 drm/i915: Don't disable interrupts on PREEMPT_RT during atomic updates
• 13e2d41 drm,radeon,i915: Use preempt_disable/enable_rt() where recommended
• 3ca5dbf random: Make it work on rt
• 4d07cdf x86: stackprotector: Avoid random pool on rt
• 625193b panic: skip get_random_bytes for RT_FULL in init_oops_id
• 435b065 crypto: cryptd - add a lock instead preempt_disable/local_bh_disable
• 6329790 crypto: limit more FPU-enabled sections
• 5190ea9 scsi/fcoe: Make RT aware.
• 8b6bd58 md: raid5: Make raid5_percpu handling RT aware
• 35da1a4 drivers/block/zram: Replace bit spinlocks with rtmutex for -rt
• a377dcd block/mq: do not invoke preempt_disable()
• 8596053 net: Remove preemption disabling in netif_rx()
• 7bcfc0a net: dev: always take qdisc's busylock in __dev_xmit_skb()
• b91f0be net: Dequeue in dev_cpu_dead() without the lock
• 08f72cc net: Use skbufhead with raw lock
• 34d9adb sunrpc: Make svc_xprt_do_enqueue() use get_cpu_light()
• cd5a07c net/core: use local_bh_disable() in netif_rx_ni()
• 256ed20 net: Properly annotate the try-lock for the seqlock
• 13f621d net/Qdisc: use a seqlock instead seqcount
• 72d6f4f rcutorture: Avoid problematic critical section nesting on RT
• 8abf1b2 rcu: Delay RCU-selftests
• 0b9358c fs: namespace: Use cpu_chill() in trylock loops
• 3e649cd rt: Introduce cpu_chill()
• 6577676 fs/dcache: disable preemption on i_dir_seq's write side
• b6b25f3 fs/dcache: use swait_queue instead of waitqueue
• bbd667d ptrace: fix ptrace vs tasklist_lock race
• c8d6844 signal: Revert ptrace preempt magic
• c6d6f9c mm/scatterlist: Do not disable irqs on RT
• d69a7f2 mm/vmalloc: Another preempt disable region which sucks
• 4e9fa61 mm/zsmalloc: copy with get_cpu_var() and locking
• 782bf49 mm/memcontrol: Replace local_irq_disable with local locks
• 25de25a mm/memcontrol: Don't call schedule_work_on in preemption disabled context
• 6e041ac mm: memcontrol: Replace disable-IRQ locking with a local_lock
• 8580430 mm: memcontrol: Add an argument to refill_stock() to indicate locking
• d0964c3 u64_stats: Disable preemption on 32bit-UP/SMP with RT during updates
• 6288847 mm/memcontrol: Disable preemption in __mod_memcg_lruvec_state()
• fd1745b mm/vmstat: Protect per cpu variables with preempt disable on RT
• 07be330 mm: slub: Don't enable partial CPU caches on PREEMPT_RT by default
• 1473115 mm: page_alloc: Use migrate_disable() in drain_local_pages_wq()
• 7b51cfe mm, slub: Duct tape lockdep_assert_held(local_lock_t) on RT
• ef1919f irqwork: push most work into softirq context
• 61f56f3 softirq: Disable softirq stacks for RT
• d98b564 softirq: Check preemption after reenabling interrupts
• 6d59282 cpuset: Convert callback_lock to raw_spinlock_t
• bf37891 sched: Disable TTWU_QUEUE on RT
• e1ca6ff sched: Do not account rcu_preempt_depth on RT in might_sleep()
• 62c341d kernel/sched: move stack + kprobe clean up to __put_task_struct()
• 7da8773 sched: Move mmdrop to RCU on RT
• 93fcb6d sched: Limit the number of task migrations per batch
• efad5fe kernel/sched: add {put|get}_cpu_light()
• 468c014 preempt: Provide preempt_*_(no)rt variants
• 32f3c13 lockdep: disable self-test
• 63bf6d3 lockdep: selftest: fix warnings due to missing PREEMPT_RT conditionals
• d73448c lockdep: selftest: Only do hardirq context test for raw spinlock
• a89aefc lockdep: Make it RT aware
• 5419cc6 locking: don't check for __LINUX_SPINLOCK_TYPES_H on -RT archs
• d1184a4 locking/RT: Add might sleeping annotation.
• df4f4e0 locking/local_lock: Add RT support
• 0fdc3cb locking/local_lock: Prepare for RT support
• ba5d7ea locking/rtmutex: Add adaptive spinwait mechanism
• 8e39f8f locking/rtmutex: Implement equal priority lock stealing
• aa8c4cd preempt: Adjust PREEMPT_LOCK_OFFSET for RT
• eaaa5e8 rtmutex: Prevent lockdep false positive with PI futexes
• a796a11 futex: Prevent requeue_pi() lock nesting issue on RT
• caf90d1 futex: Clarify comment in futex_requeue()
• e67ddc7 futex: Restructure futex_requeue()
• f3ffb1c futex: Correct the number of requeued waiters for PI
• d8411ab futex: Cleanup stale comments
• 1e1c70c futex: Validate waiter correctly in futex_proxy_trylock_atomic()
• fc6e6a8 lib/test_lockup: Adapt to changed variables.
• d64c4ab locking/rtmutex: Add mutex variant for RT
• 8cbe9cb locking/mutex: Exclude non-ww_mutex API for RT
• 9e1721d locking/mutex: Rearrange items in mutex.h
• 61df591 locking/mutex: Replace struct mutex in core code
• 9e38af0 locking/ww_mutex: Switch to _mutex_t
• 0d00cb9 locking/mutex: Rename the ww_mutex relevant functions
• c065271 locking/mutex: Introduce _mutex_t
• b0bb8d3 locking/mutex: Make mutex::wait_lock raw
• 52f869a locking/ww_mutex: Move ww_mutex declarations into ww_mutex.h
• 5e5f46d locking/mutex: Move waiter to core header
• 72a31aa locking/mutex: Consolidate core headers
• 387b127 locking/rwlock: Provide RT variant
• 3779e68 locking/spinlock: Provide RT variant
• 052c362 locking/rtmutex: Provide the spin/rwlock core lock function
• a78d151 locking/spinlock: Provide RT variant header
• 1d0de8e locking/spinlock: Provide RT specific spinlock type
• 1eabaec locking/rtmutex: Include only rbtree types
• 3f10059 rbtree: Split out the rbtree type definitions
• 98c59a9 locking/lockdep: Reduce includes in debug_locks.h
• e0594a0 locking/rtmutex: Prevent future include recursion hell
• d1739ad locking/spinlock: Split the lock types header
• a891c54 locking/rtmutex: Guard regular sleeping locks specific functions
• a7844d9 locking/rtmutex: Prepare RT rt_mutex_wake_q for RT locks
• 908d294 locking/rtmutex: Use rt_mutex_wake_q_head
• a0477bf locking/rtmutex: Provide rt_mutex_wake_q and helpers
• 5328155 locking/rtmutex: Add wake_state to rt_mutex_waiter
• 1a83a3b locking/rwsem: Add rtmutex based R/W semaphore implementation
• 28b8677 locking: Add base code for RT rw_semaphore and rwlock
• e03cbdc locking/rtmutex: Provide lockdep less variants of rtmutex interfaces
• fb5c624 locking/rtmutex: Provide rt_mutex_slowlock_locked()
• d6de1c1 rtmutex: Split API and implementation
• 9abf291 rtmutex: Convert macros to inlines
• 6d3f059 sched/wake_q: Provide WAKE_Q_HEAD_INITIALIZER
• e5cc3ca sched: Provide schedule point for RT locks
• bf96032 sched: Rework the __schedule() preempt argument
• 8b3163b sched: Prepare for RT sleeping spin/rwlocks
• e537607 sched: Introduce TASK_RTLOCK_WAIT
• 7b569a8 sched: Split out the wakeup state check
• bee357c debugobjects: Make RT aware
• e1a2ed9 trace: Add migrate-disabled counter to tracing output
• f507f34 pid.h: include atomic.h
• 930fe8d wait.h: include atomic.h
• 276abf4 efi: Allow efi=runtime
• cdfc123 efi: Disable runtime services on RT
• 6107960 net/core: disable NET_RX_BUSY_POLL on RT
• fdfbb25 sched: Disable CONFIG_RT_GROUP_SCHED on RT
• 8ec5e35 mm: Allow only SLUB on RT
• 853484e kconfig: Disable config options which are not RT compatible
• b0873a0 leds: trigger: disable CPU trigger on -RT
• 3480984 jump-label: disable if stop_machine() is used
• f9bffbd genirq: Disable irqpoll on -rt
• bae73e9 genirq: update irq_set_irqchip_state documentation
• abe17fc smp: Wake ksoftirqd on PREEMPT_RT instead do_softirq().
• d7a1345 samples/kfifo: Rename read_lock/write_lock
• 554e55b tcp: Remove superfluous BH-disable around listening_hash
• 2ba152e net: Move lockdep where it belongs
• ba75f58 shmem: Use raw_spinlock_t for ->stat_lock
• 109e285 mm: workingset: replace IRQ-off check with a lockdep assert.
• 64d8a21 cgroup: use irqsave in cgroup_rstat_flush_locked()
• 8ba34ad notifier: Make atomic_notifiers use raw_spinlock
• 10bc787 genirq: Move prio assignment into the newly created thread
• 3581157 kthread: Move prio/affinite change into the newly created thread
• 0585cfb mm, slub: Correct ordering in slab_unlock()
• 340e7c4 mm, slub: convert kmem_cpu_slab protection to local_lock
• 2180da7 mm, slub: use migrate_disable() on PREEMPT_RT
• 98ac7c8 mm, slub: make slab_lock() disable irqs with PREEMPT_RT
• dde8c73 mm, slub: optionally save/restore irqs in slab_[un]lock()/
• de1f249 mm: slub: Make object_map_lock a raw_spinlock_t
• 12a3a78 mm: slub: Move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context
• 6e256a7 mm, slab: make flush_slab() possible to call with irqs enabled
• f66b34c mm, slub: don't disable irqs in slub_cpu_dead()
• 1574226 mm, slub: only disable irq with spin_lock in __unfreeze_partials()
• 02194b5 mm, slub: detach percpu partial list in unfreeze_partials() using this_cpu_cmpxchg()
• 62047a8 mm, slub: detach whole partial list at once in unfreeze_partials()
• 85fd98f mm, slub: discard slabs in unfreeze_partials() without irqs disabled
• bfcb75f mm, slub: move irq control into unfreeze_partials()
• e6acdc5 mm, slub: call deactivate_slab() without disabling irqs
• fc54ebb mm, slub: make locking in deactivate_slab() irq-safe
• 378a859 mm, slub: move reset of c->page and freelist out of deactivate_slab()
• a1bedf1 mm, slub: stop disabling irqs around get_partial()
• e7fa6bb mm, slub: check new pages with restored irqs
• 843f169 mm, slub: validate slab from partial list or page allocator before making it cpu slab
• 033708e mm, slub: restore irqs around calling new_slab()
• aa890dd mm, slub: move disabling irqs closer to get_partial() in ___slab_alloc()
• 8c1d368 mm, slub: do initial checks in ___slab_alloc() with irqs enabled
• 12c69ba mm, slub: move disabling/enabling irqs to ___slab_alloc()
• 78ed20c mm, slub: simplify kmem_cache_cpu and tid setup
• ae3b1f1 mm, slub: restructure new page checks in ___slab_alloc()
• d071b8e mm, slub: return slab page from get_partial() and set c->page afterwards
• 1b92ed6 mm, slub: dissolve new_slab_objects() into ___slab_alloc()
• 3c7b04f mm, slub: extract get_partial() from new_slab_objects()
• 49dde93 mm, slub: unify cmpxchg_double_slab() and __cmpxchg_double_slab()
• 26d8900 mm, slub: remove redundant unfreeze_partials() from put_cpu_partial()
• 8f9b6e2 mm, slub: don't disable irq for debug_check_no_locks_freed()
• bec329b mm, slub: allocate private object map for validate_slab_cache()
• cea6298 mm, slub: allocate private object map for sysfs listings
• 0492d54 mm, slub: don't call flush_all() from list_locations()
• 72f1ab0 mm/page_alloc: Split per cpu page lists and zone stats -fix
• 7d4d69c mm/page_alloc: Update PGFREE outside the zone lock in __free_pages_ok
• 8ec908f mm/page_alloc: Avoid conflating IRQs disabled with zone->lock
• b6ff396 mm/page_alloc: Explicitly acquire the zone lock in __free_pages_ok
• 16e165b mm/page_alloc: Reduce duration that IRQs are disabled for VM counters
• c7285ff mm/page_alloc: Batch the accounting updates in the bulk allocator
• 069f3cf mm/vmstat: Inline NUMA event counter updates
• 39642ef mm/vmstat: Convert NUMA statistics to basic NUMA counters
• 7e05740 mm/page_alloc: Convert per-cpu list protection to local_lock
• b40b27f mm/page_alloc: Split per cpu page lists and zone stats
• d36c3eb timers: Move clearing of base::timer_running under base::lock
• 1d1164a highmem: Don't disable preemption on RT in kmap_atomic()
• 63cf1e4 printk: add pr_flush()
• b41f91f printk: add console handover
• 4a181ae printk: remove deferred printing
• c4049cf printk: move console printing to kthreads
• 4b788a5 printk: introduce kernel sync mode
• 7995ace printk: use seqcount_latch for console_seq
• 19aa624 printk: combine boot_delay_msec() into printk_delay()
• 109255d printk: relocate printk_delay() and vprintk_default()
• b94b127 serial: 8250: implement write_atomic
• 8d4fe69 kdb: only use atomic consoles for output mirroring
• 735eda8 console: add write_atomic interface
• 8c1c981 printk: convert @syslog_lock to spin_lock
• 114233f printk: remove safe buffers
• 2baa483 printk: track/limit recursion

Homepage
Download Linux 5.13.1-rt1-xanmod1 source from GitHub