Messages in this thread |  | | | Date | Mon, 14 Mar 2005 05:53:27 +0100 | | From | Christian Schmid <> | | Subject | Re: BUG: Slowdown on 3000 socket-machines tracked down |
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>>This effect appeared on 1 task and on 200 tasks. I dont know what it is, but with HT off it doesnt >>appear anymore. The slow-down still appears when lower_zone_protection is set to 0 but the peak at >>80 MB disappeared when set to 1024. I am now running at 95 MB/Sec smoothly. >> > > OK well that is a good result for you. Thanks for sticking with it. > Unfortunately you'll probably not want to test any patches on your > production system, so the cause of the problem will be difficult to > fix. > > I am working on patches which improve HT performance in some > situations though, so with luck they will cure your problems too. > Basically I think SMP "balancing" is too aggressive - and this may > explain why 2.6.10 was worse for you, it had patches to *increase* > the aggressiveness of balancing. > > The other thing that worries me is your need for lower_zone_protection. > I think this may be due to unbalanced highmem vs lowmem reclaim. It > would be interesting to know if those patches I sent you improve this. > They certainly improve reclaim balancing for me... but again I guess > you'll be reluctant to do much experimentation :\
I have tested your patch and unfortunately on 2.6.11 it didnt change anything :( I reported this before, or do you mean something else? I am of course willing to test patches as I do not want to stick with 2.6.10 forever. - 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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