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Date: Tue, 05 Jun 2007 11:02:00 +1000 From: Rusty Russell <rusty@...tcorp.com.au> To: Olof Johansson <olof@...om.net> Cc: Matt Mackall <mpm@...enic.com>, Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org, Linux-kernel@...r.kernel.org, Stephen Rothwell <sfr@...b.auug.org.au> Subject: Re: Interesting interaction between lguest and CFS On Mon, 2007-06-04 at 17:58 -0500, Olof Johansson wrote: > 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. Hmm, I thought that was only supposed to happen for "interruptless" consoles? Rusty. - 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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