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    SubjectRe: 2.6.0-test8/test9 io scheduler needs tuning?
    On Tuesday 28 October 2003 11:54, Nick Piggin wrote:
    > Nigel Cunningham wrote:
    > >As you rightly guessed, I was forgetting there are now 1000 jiffies per
    > >second.
    > >
    > >With your patch applied, I can achieve something close to 2.4
    > >performance, but only if I set the limit on the number of pages to
    > >submit at one time quite high. If I set it to 3000, I can get 20107 4K
    > >pages written in 5267 jiffies (14MB/s) and can read them back at resume
    > >time (so cache is not a factor) in 4620 jiffies (16MB/s). In 2.4, I
    > >normally set the limit on async commits to 100, and achieve the same
    > >performance. 100 here makes it very jerky and much slower.
    > >
    > >Could there be some timeout value on BIOs that I might be able to
    > >tweak/disable during suspend?
    > >
    > Try setting /sys/block/xxx/queue/iosched/antic_expire to 0 on your
    > device under IO and see how it goes. That shouldn't be causing the
    > problem though, especially as you are mostly writing I think?
    > Otherwise might possibly be the queue plugging stuff, or maybe a
    > regression in the disk driver.

    Haven't done much of 2.6 swsusp testing due to the little diversion
    with the scheduler, however I did notice one of those dreaded DMA
    timeouts with the SIS chipset again.


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