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Wed, 05 Apr 2006 @ 16:47 -0400, Bill Davidsen said: Sorry for the late reply, and if this is a duplicate. > >I shouldn't be suffering from swap storms. > > Agreed, does meminfo show that you are? meminfo? procinfo and other tools show a lot swapping, if that's what you mean, and you can see it in disk I/O to the swap drives as well. > The reason I ask is that I have noted that large memory machines and CD/DVD > image writing suffer from some interesting disk write patterns. The image > being built gets cached but not written, then the file is closed. At some > point the kernel notices several GB of old unwritten data and decides to > write it. This makes everything pretty slow for a while, even if you have > 100MB/s disk system. I see that kind of behavior quite a lot. Not just for DVD/CD images either. Basically any large data processing fills memory with cached file data at the expense of other programs and data. > In theory you should be able to tune this, but in practice I see what > you do. On small memory machines it's less noticable, oddly. I tried putting swapiness down to 30. It helped, most of the time, but still I saw way too much useless file data being cached. I would personally rather just limit how much file data can be cached. I don't mind agressive swapping, I just hate seeing a ton of file data being cached that isn't going to be used again. I'm also trying the ck kernels just to see how they run. So far they work better. -- shannon "AT" widomaker.com -- ["All of us get lost in the darkness, dreamers turn to look at the stars" -- Rush ] - 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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