Messages in this thread | | | From | Roy Sigurd Karlsbakk <> | Subject | Re: [2.4 BUFFERING BUG] (was [BUG] 2.4 VM sucks. Again) | Date | Wed, 10 Jul 2002 10:14:05 +0200 |
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On Wednesday 10 July 2002 10:05, Andrew Morton wrote: > Roy Sigurd Karlsbakk wrote: > > hi > > > > I've been using the patch below from Andrew for some weeks now, sometimes > > under quite heavy load, and find it quite stable. > > Wish we knew why. I've tried many times to reproduce the problem > which you're seeing. With just two gigs of memory, buffer_heads > really cannot explain anything. It's weird.
well - firstly, I'm using _1_ gig of memory - highmem (= 900 megs something) secondly - I have reproduced it on two different installations, although on the same hardware - standard PC with SiS MB and an extra promise controller, RAID-0 on 4 drives and chunksize 1MB. Given a 30-50 processes each reading a 4gig file and sending it over HTTP, everything works fine _if_ and only _if_ the client reads at high speed. If, however, the client reads at normal streaming speed (4,3Mbps), buffers go bOOM.
> We discussed this in Ottawa - I guess Andrea will add the toss-the-buffers > code on the read side (basically the filemap.c stuff). That may > be sufficient, but without an understanding of what is going on, > it is hard to predict.
Is there _any_ more data I can give, or any more testing I can do, then I'll do my very best to help
roy -- Roy Sigurd Karlsbakk, Datavaktmester
Computers are like air conditioners. They stop working when you open Windows.
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