Date: Tue, 25 Oct 2005 20:29:59 +0300 From: "Gleb Kozyrev" <gkozyrev@ukr.net> To: "Kris Kennaway" <kris@obsecurity.org>, <current@FreeBSD.org> Subject: Re: syncer going nuts on 6.0 Message-ID: <000a01c5d989$ba089a00$0130a8c0@Gleb> References: <20051025155930.GF93337@xor.obsecurity.org>
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Kris Kennaway wrote to <current@FreeBSD.org> on Tue, 25 Oct 2005 11:59:33 -0400: KK> I have 3 UP 6.0 machines that are currently stuck using 100-epsilon% KK> of CPU in the syncer: KK> last pid: 17621; load averages: 9.02, 7.21, 4.82 KK> up 3+18:15:31 +08:49:50 KK> 73 processes: 2 running, 47 sleeping, 24 waiting KK> CPU states: 0.0% user, 0.0% nice, 100% system, 0.0% interrupt, 0.0% idle KK> Mem: 27M Active, 149M Inact, 137M Wired, 4K Cache, 109M Buf, 684M Free KK> Swap: 2048M Total, 8K Used, 2048M Free KK> PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND KK> 38 root 1 -4 0 0K 8K getblk 180:21 431.30% syncer KK> 17474 root 1 -4 0 1928K 1428K getblk 1:13 28.71% rm KK> 11 root 1 171 52 0K 8K RUN 20.2H 8.94% idle KK> rm -rf is just removing a single ufs directory tree, but it's taking KK> *much* longer than it should be (order of 5 minutes instead of 30 KK> seconds it took for the other 25 machines), and the machine was KK> extremely unresponsive in the meantime (response times of 30 seconds KK> to run commands like top). WITNESS is on, but it's also on on the KK> other 25 machines that aren't seeing a problem under what should be KK> analogous loads. I've seen the same problem and it seems to be related with filesystem snapshots. -- With best regards, Gleb Kozyrev.
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