Date: Tue, 13 Oct 2009 09:58:09 +0200 From: Thomas Backman <serenity@exscape.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Extreme console latency during disk IO (8.0-RC1, previous releases also affected according to others) Message-ID: <3C775420-9B3D-4971-BDA8-4D2FD507587F@exscape.org> In-Reply-To: <20091012223529.GA77733@onelab2.iet.unipi.it> References: <E316139E-FFCF-432F-8DCE-62B120C38E55@exscape.org> <CC16B639-7A75-4016-A8A8-5C59E9CD5E95@exscape.org> <20091012223529.GA77733@onelab2.iet.unipi.it>
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On Oct 13, 2009, at 12:35 AM, Luigi Rizzo wrote: > On Mon, Oct 12, 2009 at 09:48:42PM +0200, Thomas Backman wrote: >> I'm copying this over from the freebsd-performance list, as I'm >> looking for a few more opinions - not on the problems *I* am having, >> but rather to check whether the problem is universal or not, and if >> not, find a possible common factor. >> In other words: I want to hear about your experiences, *good or bad*! >> >> Here's the original thread (not from the beginning, though): >> http://lists.freebsd.org/pipermail/freebsd-performance/2009-October/003843.html >> >> Long story short, my version: when the disk is stressed hard enough, >> console IO becomes COMPLETELY unbearable. 10+ seconds to switch >> between windows in screen(1), running (or even typing) simple >> commands, etc. This happens both via SSH and the serial console. > > hi, > this issue (not specific to FreeBSD, and not new -- it has been > like this forever) is discussed in some detail here > > http://www.bsdcan.org/2009/schedule/events/122.en.html > > The following code (a bit outdated) can help > > http://lists.freebsd.org/pipermail/freebsd-stable/2009-March/048704.html > > cheers > luigi Hmm, how stable would you say the code is? (And/or has there been any progress since March?) I'd prefer something that I feel confident in using in production, and the warning in the README clearly says "stay away!". Regards, Thomas
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