* Re: [Scst-devel] Linux kernel and block I/O performance [not found] <e2e108260903251117n54d0275bk8bf7c9398d9987da@mail.gmail.com> @ 2009-03-31 17:39 ` Vladislav Bolkhovitin 0 siblings, 0 replies; only message in thread From: Vladislav Bolkhovitin @ 2009-03-31 17:39 UTC (permalink / raw) To: Bart Van Assche; +Cc: scst-devel, Jens Axboe, linux-kernel Hello Bart Van Assche, on 03/25/2009 09:17 PM wrote: > Hello, > > For anyone who's running SCST performance measurements, please have a > look at http://lwn.net/Articles/325307/. In this article it is > explained why 2.6.25 and 2.6.29 perform three times faster on some I/O > benchmarks than 2.6.26, 2.6.27 and 2.6.28. The relevant kernel commits > are: > > 2.6.26: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=18ce3751ccd488c78d3827e9f6bf54e6322676fb > 2.6.29: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=78f707bfc723552e8309b7c38a8d0cc51012e813 Interesting. I've just checked with 2.6.29 on the target. With iSCSI still ext3 as a backstorage FS on the target a lot slower on writes than xfs (25-100%, deviation between runs is very high). On my system it's something like 50-80MB/s vs 100+MB/s. In both cases initiator formatted the device in ext3. Test application was famous "dd if=/dev/zero of=/mnt/q bs=512K". Thanks, Vlad ^ permalink raw reply [flat|nested] only message in thread
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[not found] <e2e108260903251117n54d0275bk8bf7c9398d9987da@mail.gmail.com>
2009-03-31 17:39 ` [Scst-devel] Linux kernel and block I/O performance Vladislav Bolkhovitin
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