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Date: Mon, 4 Jun 2007 17:58:27 -0500 From: olof@...om.net (Olof Johansson) To: Matt Mackall <mpm@...enic.com> Cc: Ingo Molnar <mingo@...e.hu>, Rusty Russell <rusty@...tcorp.com.au>, akpm@...ux-foundation.org, Linux-kernel@...r.kernel.org Subject: Re: Interesting interaction between lguest and CFS On Mon, Jun 04, 2007 at 12:37:10PM -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. > > The system isn't swapping and has basically no I/O load. Is this on hvc console? The hvc driver was recently modified to back off it's timing interval when there's no input, the max value is 2 seconds. See b791072ba3c3b29bab1890963bde52eb944a8451 for the changes in question. -Olof - 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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