Date: Mon, 08 Feb 2010 15:41:14 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: ATA_CAM + ZFS gives short 1-2 seconds system freeze on disk load Message-ID: <hkp7q4$b4p$1@ger.gmane.org> In-Reply-To: <20100208143329.GA12057@megatron.madpilot.net> References: <20100208143329.GA12057@megatron.madpilot.net>
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On 02/08/10 15:33, Guido Falsi wrote: > It looks like it freezes the system for the second or two it takes > to flush buffers to disk when there are big outputs. This happens > when decompressiong big distfiles, mainly. The openoffice port > triggers this almost continuosly every few seconds during compilation. > I've also seen this when working with big files(for example graphic > images in uncompressed formats). > > It gets very annoying and I don't remember this happening before > activating the ATA_CAM flag. There was some slowdown with big disk > access, but not a total freeze. I think ZFS does this all the time, i.e. regardless of underlying device drivers. Can you test your theory by going to an older kernel and keeping *everything* else the same?
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