>>>>> "Andrew" == Andrew Clayton <andrew@xxxxxxxxxxxxxxxxxx> writes: Andrew> On Thu, 4 Oct 2007 10:10:02 -0400 (EDT), Justin Piszcz wrote: >> Also, did performance just go to crap one day or was it gradual? Andrew> IIRC I just noticed one day that firefox and vim was Andrew> stalling. That was back in February/March I think. At the time Andrew> the server was running a 2.6.18 kernel, since then I've tried Andrew> a few kernels in between that and currently 2.6.23-rc9 Andrew> Something seems to be periodically causing a lot of activity Andrew> that max's out the stripe_cache for a few seconds (when I was Andrew> trying to look with blktrace, it seemed pdflush was doing a Andrew> lot of activity during this time). Andrew> What I had noticed just recently was when I was the only one Andrew> doing IO on the server (no NFS running and I was logged in at Andrew> the console) even just patching the kernel was crawling to a Andrew> halt. How much memory does this system have? Have you checked the output of /proc/mtrr at all? There' have been reports of systems with a bad BIOS that gets the memory map wrong, causing access to memory to slow down drastically. So if you have 2gb of RAM, try booting with mem=1900m or something like that and seeing if things are better for you. Make sure your BIOS is upto the latest level as well. John - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
