* Martin Knoblauch <[email protected]> wrote:
> Hi ,
>
> just to give some feedback on 2.6.24-rc1. For some time I am tracking
> IO/writeback problems that hurt system responsiveness big-time. I
> tested Peters stuff together with Fenguangs additions and it looked
> promising. Therefore I was very happy to see Peters stuff going into
> 2.6.24 and waited eagerly for rc1. In short, I am impressed. This
> really looks good. IO throughput is great and I could not reproduce
> the responsiveness problems so far.
>
> Below are a some numbers of my brute-force I/O tests that I can use
> to bring responsiveness down. My platform is a HP/DL380g4, dual CPUs,
> HT-enabled, 8 GB Memory, SmartaArray6i controller with 4x72GB SCSI
> disks as RAID5 (battery protected writeback cahe enabled) and gigabit
> networking (tg3). User space is 64-bit RHEL4.3
>
> I am basically doing copies using "dd" with 1MB blocksize. Local
> Filesystem ist ext2 (noatime). IO-Scheduler is dealine, as it tends
> to give best results. NFS3 Server is a Sun/T2000/Solaris10. The tests
> are:
>
> dd1 - copy 16 GB from /dev/zero to local FS
> dd1-dir - same, but using O_DIRECT for output
> dd2/dd2-dir - copy 2x7.6 GB in parallel from /dev/zero to local FS
> dd3/dd3-dir - copy 3x5.2 GB in parallel from /dev/zero lo local FS
> net1 - copy 5.2 GB from NFS3 share to local FS
> mix3 - copy 3x5.2 GB from /dev/zero to local disk and two NFS3 shares
>
> I did the numbers for 2.6.19.2, 2.6.22.6 and 2.6.24-rc1. All units
> are MB/sec.
>
> test 2.6.19.2 2.6.22.6 2.6.24.-rc1
> ----------------------------------------------------------------
> dd1 28 50 96
> dd1-dir 88 88 86
> dd2 2x16.5 2x11 2x44.5
> dd2-dir 2x44 2x44 2x43
> dd3 3x9.8 3x8.7 3x30
> dd3-dir 3x29.5 3x29.5 3x28.5
> net1 30-33 50-55 37-52
> mix3 17/32 25/50 96/35 (disk/combined-network)
wow, really nice results! Peter does know how to make stuff fast :) Now
lets pick up some of Peter's other, previously discarded patches as well
:-)
Such as the rewritten reclaim (clockpro) patches:
http://programming.kicks-ass.net/kernel-patches/page-replace/
The improve-swap-performance (swap-token) patches:
http://programming.kicks-ass.net/kernel-patches/swap_token/
His enable-swap-over-NFS [and other complex IO transports] patches:
http://programming.kicks-ass.net/kernel-patches/vm_deadlock/
And the concurrent pagecache patches:
http://programming.kicks-ass.net/kernel-patches/concurrent-pagecache/
as a starter :-) I think the MM should get out of deep-feature-freeze
mode - there's tons of room to improve :-/
Ingo "runs and hides" Molnar
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