Date: Mon, 14 Apr 2003 11:37:08 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: David Schultz <das@FreeBSD.ORG> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: no idle CPU ... system hogging it all ... Message-ID: <20030414113105.N9001@hub.org> In-Reply-To: <20030414132519.GA19543@HAL9000.homeunix.com> References: <20030411165002.L9067@hub.org> <20030414132519.GA19543@HAL9000.homeunix.com>
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On Mon, 14 Apr 2003, David Schultz wrote: > On Fri, Apr 11, 2003, Marc G. Fournier wrote: > > > > Its been looking like this pretty much all day ... top shows nothing > > major, and the drive looks reaonably quiet ... there is nothing in > > messages to indicate a problem that I can see (even those enclosure > > messages have been reasonably quiet) ... > > You can profile the kernel to find out, although at this hour I > probably can't recall all the necessary details. I believe you > need to say 'make buildkernel CONFIGARGS=-p', then use kgmon(8) > and gprof(1) to extract and analyze the data. > > Based on the ps output you gave, it looks like vmdaemon and syncer > are taking up most of the time. This suggests that perhaps there > is a hardware or driver problem with disk I/O. Some drivers > perform very small delays to wait for the hardware by spinning > instead of eating the overhead of a context switch. It could be > that one of these drivers has a bug, or the hardware is taking > longer than expected to respond. That was/is kinda what I'm expecting ... so far, luck/experience with this Adaptec 2120S controller hasn't been great :( Scott got rid of the TIMEOUT issue, but now the server hangs solid every few days to the point that the keyboard is unresponsive to either a ctl-alt-esc or ctl-alt-del :(
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