Messages in this thread | | | Date | Sun, 22 Aug 2004 21:17:19 +1000 | From | Con Kolivas <> | Subject | 2.6.8.1-ck4 |
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Patchset update. These are patches designed to improve system responsiveness with specific emphasis on the desktop, but configurable to any workload.
The short time between ck3 and ck4 is for two reasons. First Ingo discovered a nasty bug affecting X performance and I believe I made a reasonable breakthrough on the never ending desktop vm swappiness saga.
Web site with faq: http://kernel.kolivas.org Patches (with split-out also): http://ck.kolivas.org/patches/2.6/2.6.8.1/2.6.8.1-ck4/
Added since 2.6.8.1-ck3: +mapped_watermark.diff
This readjusts the way memory is evicted by lightly removing cached ram once the ram is more than 2/3 full, if less than the "mapped watermark" percent of ram is mapped ram (ie applications). The normal system is to aggresively start scanning ram once it is completely full. The benefits of this are: 1. Allocating memory while ram is being lightly scanned is faster and cheaper than when it is being heavily scanned. 2. There is usually some free ram which tends to speed up application startup times. 3. Swapping is an unusual event instead of a common one if you have enough ram for your workload. 4. It is rare for your applications to be swapped out by file cache pressure. Disadvantage: Less file cache - but can be offset with the tunable
The mapped watermark is configurable so a server for example might be happy to have a lower mapped percentage. The default is 66 and a server might like 33 (0 is also fine)
echo 33 > /proc/sys/vm/mapped
This patch removes the swappiness knob entirely and deprecates all my previous vm hacks (autoregulated swappiness, hard swappiness, kiflush).
+ioport-latency-fix-2.6.8.1.patch A nasty bug Ingo tracked down that caused high latencies and cache trashing with X.
Changed: ~Staircase8.0 Backed out a tweak designed to improve behaviour under filesystem load - I am avoiding all "tweaks" in the design, and it's effectiveness was questionable. Added a tiny check to recalc_task_prio which should make it safe when the Hz value is set below 500.
~1g_lowmem_i386 Made the 1Gb of lowmem configurable if highmem is disabled.
Removed: -hard_swappiness1.diff -kiflush3.diff Deprected in favour of mapped_watermark
Full patchlist: from_2.6.8.1_to_staircase8.0.bz2 schedrange.diff schedbatch2.4.diff schediso2.5.diff sched-adjust-p4gain mapped_watermark.diff defaultcfq.diff config_hz.diff 1g_lowmem_i386.diff akpm-latency-fix.patch 9000-SuSE-117-writeback-lat.patch cddvd-cmdfilter-drop.patch cool-spinlocks-i386.diff bio_uncopy_user-mem-leak.patch bio_uncopy_user2.diff ioport-latency-fix-2.6.8.1.patch supermount-ng204.diff.bz2 fbsplash-0.9-r5-2.6.8-rc3.patch.bz2 make-tree_lock-an-rwlock.patch.bz2 invalidate_inodes-speedup.patch 2.6.8.1-mm2-reiser4.diff.bz2 2.6.8.1-ck4-version.diff
Cheers, Con [unhandled content-type:application/pgp-signature] | |