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Open Source and information security mailing list archives
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Date: Mon, 4 Jun 2007 21:34:12 -0500 From: Matt Mackall <mpm@...enic.com> To: Rusty Russell <rusty@...tcorp.com.au> Cc: Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org, Linux-kernel@...r.kernel.org Subject: Re: Interesting interaction between lguest and CFS On Tue, Jun 05, 2007 at 10:18:54AM +1000, Rusty Russell wrote: > On Mon, 2007-06-04 at 12:37 -0500, Matt Mackall wrote: > > With 2.6.22-rc3-mm1, I've got a long-running video transcoding going > > on. In other windows, I'm compiling, reading email, etc. with no > > noticeable problems. > > > > If I fire up lguest and leave it sitting at a shell prompt for a > > couple moments, when I return to type something at the prompt, it can > > take 2-3 seconds for my input to echo. Once it starts responding, > > typing latency disappears. Suspend the other app and the latency > > disappears. > > This sounds like the waker process (nice 19) not getting a chance to > run. You can hack around it for the moment by changing "nice(19)" in > Documentation/lguest/lguest.c to something less aggressive. Manual renicing seems to have done the trick. This is still a little suspicious though. Why does it take two seconds to wake up and then behave responsively for a long interval after that? -- Mathematics is the supreme nostalgia of our time. - 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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