Messages in this thread | | | Subject | Re: possible bug with RAID | From | Steve Lord <> | Date | 11 Dec 2001 15:18:31 -0600 |
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On Tue, 2001-12-11 at 13:34, Steve Lord wrote: > On Tue, 2001-12-11 at 12:54, Roy Sigurd Karlsbakk wrote: > > > it would be interesting to write a simple benchmark > > > that simply reads a file at a fixed rate. *that* would > > > actually simulate your app. > > > > sure. I'm using tux+wget for that. I were just playing around with dd > > > > > sounds like a VM/balance problem. you didn't mention which kernel > > > you're using. > > > > 2.4.16 w/tux + xfs. The fs used on the raid vol is xfs > > We just got to the bottom of a problem in xfs which was causing memory > not to get cleaned as efficiently as it should be - it lead to dbench > lockups on low memory systems. It is possible you are seeing a similar > effect - we dirty all the memory and then struggle to clean it up. > > Try the attached patch. > > Steve >
OK, don't try that patch too hard, I have a better one without a race condition on the buffer head.... it should show up in the xfs cvs tree later today, I am going to stress this one a little harder first!
Steve
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