Date: Thu, 06 Mar 2008 12:14:02 +0000 From: Neil Darlow <neil@darlow.co.uk> To: freebsd-questions@freebsd.org Subject: Re: syslogd and bzip2 hogs after 6.3 to 7.0 upgrade Message-ID: <47CFE00A.7000005@darlow.co.uk> In-Reply-To: <47CFCA07.4020100@FreeBSD.org> References: <47CFC032.10806@darlow.co.uk> <47CFCA07.4020100@FreeBSD.org>
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Hi, Kris Kennaway wrote: > This should be unrelated to bzip since that is purely CPU bound. What > is causing the interrupts? Check vmstat -i. That is likely to be your > real problem. The cause of the high interrupt incidence was failed DMA operations on my DVD-RW drive. The situation arose as follows: 1) My backup program executes at 11:30 UTC and uses growisofs to create a DVD on-the-fly. 2) newsyslog executes at 00:00 UTC and compresses the logfiles with bzip2. 3) The DVD-RW drive DMA errors appear. I've rebooted the system and watched cron execute newsyslog to rotate the logs. I have a bzip2 process that's consuming over 90% of CPU. That can't be normal? Regards, Neil Darlow
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