Date: Wed, 26 Oct 2005 12:16:35 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Gleb Kozyrev <gkozyrev@ukr.net> Cc: current@FreeBSD.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: syncer going nuts on 6.0 Message-ID: <20051026161635.GB47405@xor.obsecurity.org> In-Reply-To: <000a01c5d989$ba089a00$0130a8c0@Gleb> References: <20051025155930.GF93337@xor.obsecurity.org> <000a01c5d989$ba089a00$0130a8c0@Gleb>
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On Tue, Oct 25, 2005 at 08:29:59PM +0300, Gleb Kozyrev wrote:
> Kris Kennaway wrote to <current@FreeBSD.org> on Tue, 25 Oct 2005 11:59:33=
-0400:
>=20
> KK> I have 3 UP 6.0 machines that are currently stuck using 100-epsilon%
> KK> of CPU in the syncer:
>=20
> KK> last pid: 17621; load averages: 9.02, 7.21, 4.82 =
=20
> 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 COMMA=
ND
> KK> 38 root 1 -4 0 0K 8K getblk 180:21 431.30% sync=
er
> 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
>=20
> 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.
>=20
> I've seen the same problem and it seems to be related with filesystem sna=
pshots.
I'm not using them.
Kris
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