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Date: Tue, 29 May 2007 11:58:54 +0530 From: "Satyam Sharma" <satyam.sharma@...il.com> To: "Bill Davidsen" <davidsen@....com> Cc: "Linux Kernel mailing List" <linux-kernel@...r.kernel.org> Subject: Re: What causes iowait other than waiting for i/o? Hi Bill, On 5/29/07, Bill Davidsen <davidsen@....com> wrote: > I recently noted that my system was spending a lot of time in i/o wait > when doing some tasks which I thought didn't involve i/o, as noted by > the lack of disk light activity most of the time. I thought of network, > certainly the NIC had no activity for this job. So I set up a little > loop to capture all disk i/o and network activity (including loopback). > That was no obvious help, and the program doesn't use pipes. > > At this point I'm really curious, does someone have a good clue? > > Note: I don't think this is a bug or performance issue, unless the > kernel is doing something and charging time to iowait instead of system > I don't see anything to fix, but I would like to understand. What tool / kernel instrumentation / mechanism are you using to determine that some task(s) are indeed blocked waiting for i/o? Perhaps some userspace process accounting tools could be "broken" in the sense that they generalize all uninterruptible sleep as waiting for i/o ... Satyam - 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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