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Message-ID: <20070526155223.1bedba5a@localhost> Date: Sat, 26 May 2007 15:52:23 +0200 From: Paolo Ornati <ornati@...twebnet.it> To: Tommy Vercetti <vercetti@...w.org> Cc: linux-kernel@...r.kernel.org Subject: Re: 2.6.21.1 - 97% wait time on IDE operations On Sat, 26 May 2007 15:05:38 +0200 Tommy Vercetti <vercetti@...w.org> wrote: > I was trying to get answer to my question around, but no one knows. > I do have DMA turned on, etc, yet - on extensive harddrive operations wait > time is 90+% , which means that machine is waiting, rather than doing > something meanwhile. (I guess). > Can someone describe to me , in more detail why is that happening, and what > steps should I consider to avoid it ? I couldn't find any answers that would > have help me on net. It means that the disk is slow and the CPU is fast... so while the disk is busy seeking and reading data the CPU has nothing to do but wait for it. Idle == CPU has nothing to do Waiting == CPU has nothing to do, but it will have as soon as the slow disk (or whatever) delivers data Anyway 97% is quite high... what CPU / Hard Disk do you have? What kernel version? I/O scheduler? (cat /sys/block/DEVICE/queue/scheduler) Filesystem? And what time of "operations" are you doing? -- Paolo Ornati Linux 2.6.22-rc3-cfs-v14-gf193016a on x86_64 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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