Messages in this thread | | | Date | Fri, 6 Jul 2007 05:44:33 -0700 (PDT) | From | Martin Knoblauch <> | Subject | Re: Understanding I/O behaviour |
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Brice Figureau wrote:
>> CFQ gives less (about 10-15%) throughput except for the kernel >> with the >> cfs cpu scheduler, where CFQ is on par with the other IO >> schedulers. >> > >Please have a look to kernel bug #7372: >http://bugzilla.kernel.org/show_bug.cgi?id=7372 > >It seems I encountered the almost same issue. > >The fix on my side, beside running 2.6.17 (which was working fine >for me) was to: >1) have /proc/sys/vm/vfs_cache_pressure=1 >2) have /proc/sys/vm/dirty_ratio=1 and > /proc/sys/vm/dirty_background_ratio=1 >3) have /proc/sys/vm/swappiness=2 >4) run Peter Zijlstra: per dirty device throttling patch on the > top of 2.6.21.5: >http://www.ussg.iu.edu/hypermail/linux/kernel/0706.1/2776.html
Brice,
any of them sufficient, or all together nedded? Just to avoid confusion.
Cheers Martin
------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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