A new XanMod Linux Kernel based on Linux Kernel 6.6.21 has been released. 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.

Linux 6.6.21-xanmod1

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

• 75b70b5 Linux 6.6.21-xanmod1
• 401a343 Merge tag 'v6.6.21' into 6.6
• 62e5ae5 Linux 6.6.21
• d6ac0ee drm/nouveau: don't fini scheduler before entity flush
• ece1aae selftests: mptcp: rm subflow with v4/v4mapped addr
• 8e7f31b selftests: mptcp: add mptcp_lib_is_v6
• 9d71f43 selftests: mptcp: update userspace pm test helpers
• f9190d7 selftests: mptcp: add chk_subflows_total helper
• ae1fa39 selftests: mptcp: add evts_get_info helper
• e81742f KVM/VMX: Move VERW closer to VMentry for MDS mitigation
• ae46691 KVM/VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH
• 7a62647 x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key
• ca13d8c x86/entry_32: Add VERW just before userspace transition
• 7caf330 x86/entry_64: Add VERW just before userspace transition
• 2664bb2 block: define bvec_iter as __packed __aligned(4)
• 21bbe84 gpio: fix resource unwinding order in error path
• 9c7c161 gpiolib: Fix the error path order in gpiochip_add_data_with_key()
• 92515c4 gpio: 74x164: Enable output pins after registers are reset
• 6b6282d powerpc/rtas: use correct function name for resetting TCE tables
• d4d1e4b powerpc/pseries/iommu: IOMMU table is not initialized for kdump over SR-IOV
• 5e3022e dmaengine: idxd: Ensure safe user copy of completion record
• 4d6e793 dmaengine: idxd: Remove shadow Event Log head stored in idxd
• 9819177 phy: freescale: phy-fsl-imx8-mipi-dphy: Fix alias name to use dashes
• d24fe6d dmaengine: dw-edma: eDMA: Add sync read before starting the DMA transfer in remote setup
• 227ef58 dmaengine: dw-edma: HDMA: Add sync read before starting the DMA transfer in remote setup
• 55501b7 dmaengine: dw-edma: Add HDMA remote interrupt configuration
• 3fa3dfc dmaengine: dw-edma: HDMA_V0_REMOTEL_STOP_INT_EN typo fix
• 8b5657a dmaengine: dw-edma: Fix wrong interrupt bit set for HDMA
• 3adea99 dmaengine: dw-edma: Fix the ch_count hdma callback
• 57e869b ASoC: cs35l56: fix reversed if statement in cs35l56_dspwait_asp1tx_put()
• e9eac26 af_unix: Drop oob_skb ref before purging queue in GC.
• 69e0f04 af_unix: Fix task hung while purging oob_skb in GC.
• be8a177 NFS: Fix data corruption caused by congestion.
• fa8c776 mptcp: fix possible deadlock in subflow diag
• ce0809a mptcp: fix double-free on socket dismantle
• b609ecd mptcp: fix potential wake-up event loss
• ae5530c mptcp: fix snd_wnd initialization for passive socket
• 536a661 selftests: mptcp: join: add ss mptcp support check
• 48428b0 mptcp: push at DSS boundaries
• fca4e6a mptcp: avoid printing warning once on client side
• a49ecbe mptcp: map v4 address to v6 when destroying subflow
• dff60a5 x86/cpu/intel: Detect TME keyid bits before setting MTRR mask registers
• c43b984 x86/e820: Don't reserve SETUP_RNG_SEED in e820
• d2a9510 mm/debug_vm_pgtable: fix BUG_ON with pud advanced test
• e9eeb0d pmdomain: qcom: rpmhpd: Fix enabled_corner aggregation
• 71da10e efivarfs: Request at most 512 bytes for variable names
• f1fb745 iommufd: Fix iopt_access_list_id overwrite bug
• 8db4f87 kbuild: Add -Wa,--fatal-warnings to as-instr invocation
• 9537603 riscv: add CALLER_ADDRx support
• 0c8a3d3 RISC-V: Drop invalid test from CONFIG_AS_HAS_OPTION_ARCH
• aebd67a mmc: sdhci-xenon: fix PHY init clock stability
• b4eacb3 mmc: sdhci-xenon: add timeout for PHY init complete
• 4344444 mmc: core: Fix eMMC initialization with 1-bit bus connection
• 176e662 mmc: mmci: stm32: fix DMA API overlapping mappings warning
• a69c8bb dmaengine: fsl-qdma: init irq after reg initialization
• 91b001f dmaengine: fsl-edma: correct calculation of 'nbytes' in multi-fifo scenario
• 4e0fe15 dmaengine: ptdma: use consistent DMA masks
• 1291d27 crypto: arm64/neonbs - fix out-of-bounds access on short input
• 5b696e9 dmaengine: fsl-qdma: fix SoC may hang on 16 byte unaligned read
• 737d2e9 soc: qcom: pmic_glink: Fix boot when QRTR=m
• 82dacc2 drm/amd/display: Add monitor patch for specific eDP
• 5e47662 drm/buddy: fix range bias
• baac292 Revert "drm/amd/pm: resolve reboot exception for si oland"
• 202e4f4 btrfs: send: don't issue unnecessary zero writes for trailing hole
• b1690ce btrfs: dev-replace: properly validate device names
• eb34410 btrfs: fix double free of anonymous device after snapshot creation failure
• 177d574 wifi: nl80211: reject iftype change with mesh ID change
• ad8ff8c mtd: rawnand: marvell: fix layouts
• ba60fdf mm: cachestat: fix folio read-after-free in cache walk
• 93dd420 gtp: fix use-after-free and null-ptr-deref in gtp_newlink()
• f490693 landlock: Fix asymmetric private inodes referring
• 0be289b Bluetooth: hci_bcm4377: do not mark valid bd_addr as invalid
• a4904b3 ALSA: hda/realtek: Add special fixup for Lenovo 14IRP8
• 5cdf76f ALSA: hda/realtek: fix mute/micmute LED For HP mt440
• 46fb5e7 ALSA: hda/realtek: Enable Mute LED on HP 840 G8 (MB 8AB8)
• d6ac6ff ALSA: hda/realtek: tas2781: enable subwoofer volume control
• bb06ffb ALSA: ump: Fix the discard error code from snd_ump_legacy_open()
• 22df6ff ALSA: firewire-lib: fix to check cycle continuity
• 2caa605 tomoyo: fix UAF write bug in tomoyo_write_control()
• 6f72b44 of: property: fw_devlink: Fix stupid bug in remote-endpoint parsing
• d43f8e5 btrfs: fix race between ordered extent completion and fiemap
• a278d5c riscv: Sparse-Memory/vmemmap out-of-bounds fix
• eb25716 riscv: Fix pte_leaf_size() for NAPOT
• 2b7ce74 Revert "riscv: mm: support Svnapot in huge vmap"
• e0d17ee drivers: perf: ctr_get_width function for legacy is not defined
• 2f8c094 drivers: perf: added capabilities for legacy PMU
• f678988 afs: Fix endless loop in directory parsing
• 73a6bd6 fbcon: always restore the old font data in fbcon_do_set_font()
• 8e8c66a drm/tegra: Remove existing framebuffer only if we support display
• 274bf3c RISC-V: Ignore V from the riscv,isa DT property on older T-Head CPUs
• fb3618f ASoC: soc-card: Fix missing locking in snd_soc_card_get_kcontrol()
• 4b5d89a ASoC: cs35l56: Fix deadlock in ASP1 mixer register initialization
• 9f05fe5 ASoC: cs35l56: Fix misuse of wm_adsp 'part' string for silicon revision
• c249f04 ASoC: cs35l56: Fix for initializing ASP1 mixer registers
• 044edc1 ASoC: cs35l56: Don't add the same register patch multiple times
• a2f0a68 ASoC: cs35l56: cs35l56_component_remove() must clean up wm_adsp
• 93fc01f ASoC: cs35l56: cs35l56_component_remove() must clear cs35l56->component
• cc698db riscv: Fix build error if !CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
• 99adc8b ASoC: qcom: Fix uninitialized pointer dmactl
• 841361d ASoC: qcom: convert not to use asoc_xxx()
• c92c96c ASoC: soc.h: convert asoc_xxx() to snd_soc_xxx()
• ac549de ALSA: Drop leftover snd-rtctimer stuff from Makefile
• 4a7f5ef ASoC: cs35l56: Must clear HALO_STATE before issuing SYSTEM_RESET
• fbca8ba power: supply: bq27xxx-i2c: Do not free non existing IRQ
• 11aabd7 efi/capsule-loader: fix incorrect allocation size
• 81be853 tls: fix use-after-free on failed backlog decryption
• dec5b6e tls: separate no-async decryption request handling from async
• 11121c2 tls: fix peeking with sync+async decryption
• c19fdb0 tls: decrement decrypt_pending if no async completion will be called
• 9422350 net: hsr: Use correct offset for HSR TLV values in supervisory HSR frames
• c88bf99 igb: extend PTP timestamp adjustments to i211
• 167d864 rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back
• dbc81b0 tools: ynl: fix handling of multiple mcast groups
• 80cd048 netfilter: bridge: confirm multicast packets before passing them up the stack
• 98567dc netfilter: nf_tables: allow NFPROTO_INET in nft_(match/target)_validate()
• 39e39c3 Bluetooth: qca: Fix triggering coredump implementation
• c50ce48 Bluetooth: hci_qca: Set BDA quirk bit if fwnode exists in DT
• fb3e827 Bluetooth: qca: Fix wrong event type for patch config command
• dcd646f Bluetooth: Enforce validation on max value of connection interval
• fba268a Bluetooth: hci_event: Fix handling of HCI_EV_IO_CAPA_REQUEST
• 4a91396 Bluetooth: hci_event: Fix wrongly recorded wakeup BD_ADDR
• 6699d7c Bluetooth: hci_sync: Fix accept_list when attempting to suspend
• 2ab9a19 Bluetooth: Avoid potential use-after-free in hci_error_reset
• 0a07fa1 Bluetooth: hci_sync: Check the correct flag before starting a scan
• 699b103 stmmac: Clear variable when destroying workqueue
• af6dfe9 uapi: in6: replace temporary label with rfc9486
• 2ae3d9d net: lan78xx: fix "softirq work is pending" error
• 0ec3ea6 net: usb: dm9601: fix wrong return value in dm9601_mdio_read
• 2d8003e veth: try harder when allocating queue memory
• 288218b lan78xx: enable auto speed configuration for LAN7850 if no EEPROM is detected
• 44112bc ipv6: fix potential "struct net" leak in inet6_rtm_getaddr()
• 16edf51 net: veth: clear GRO when clearing XDP even when down
• 1a86827 cpufreq: intel_pstate: fix pstate limits enforcement for adjust_perf call back
• 7322b21 tun: Fix xdp_rxq_info's queue_index when detaching
• fbccbb4 net: dpaa: fman_memac: accept phy-interface-type = "10gbase-r" in the device tree
• cbebc55 net: mctp: take ownership of skb in mctp_local_output
• a0a1db4 net: ip_tunnel: prevent perpetual headroom growth
• a2ab028 netlink: add nla be16/32 types to minlen array
• d3ada42 netlink: Fix kernel-infoleak-after-free in __skb_datagram_iter
• 03f1573 spi: cadence-qspi: fix pointer reference in runtime PM hooks
• c53b8d8 mtd: spinand: gigadevice: Fix the get ecc status issue
• 8cb8ef0 ublk: move ublk_cancel_dev() out of ub->mutex
• 2b5f169 ksmbd: fix wrong allocation size update in smb2_open()
• 0505960 ASoC: cs35l34: Fix GPIO name and drop legacy include
• d3d782b ubifs: fix possible dereference after free
• 9b4a8ea Linux 6.6.20
• af0d04f fs/ntfs3: fix build without CONFIG_NTFS3_LZX_XPRESS

Homepage
Download Linux 6.6.21-xanmod1 source from GitHub