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Message-Id: <20071026122155.45ce72e7.akpm@linux-foundation.org> Date: Fri, 26 Oct 2007 12:21:55 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Ingo Molnar <mingo@...e.hu> Cc: spamtrap@...bisoft.de, linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl, wfg@...l.ustc.edu.cn, torvalds@...ux-foundation.org, riel@...hat.com Subject: Re: 2.6.24-rc1: First impressions On Fri, 26 Oct 2007 17:22:21 +0200 Ingo Molnar <mingo@...e.hu> wrote: > > * Martin Knoblauch <spamtrap@...bisoft.de> 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! Those changes seem suspiciously large to me. I wonder if there's less physical IO happening during the timed run, and correspondingly more afterwards. > I think the MM should get out of deep-feature-freeze > mode - there's tons of room to improve :-/ Kidding. We merge about 265 MM patches in 2.6.24-rc1: 482 files changed, 8071 insertions(+), 5142 deletions(-) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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