core-dumping over NFS
Don Lewis
truckman at FreeBSD.org
Mon Jan 12 13:12:36 PST 2004
On 12 Jan, Mikhail Teterin wrote:
> . 5.2-CURRENT (Dec 14) server, RedHat-9 client:
> core is created properly, but sometimes the server goes
> into a frenzy with the sys-component (bufdaemon) taking
> up the entire 100% of the CPU-time (P4 at 2GHz); it only
> writes @4Mb/s (~14% of the disk's bandwidth) and the
> only cure is to restart the /etc/rc.d/nfsd; trying to,
> for example, switch from X11 to a textual console, when
> this is happening reliably hangs the machine.
I saw something similar a in the last month when running iozone on a
FreeBSD client with an nfs file system mounted from a FreeBSD server. I
think this was in the 5.2-BETA timeframe. The client typically ran out
of CPU first, but the server was not far behind. This happened in the
tests with the larger file and/or block sizes. Bufdaemon was typically
the big consumer of CPU.
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