core-dumping over NFS

Doug White dwhite at
Mon Jan 12 14:13:18 PST 2004

On Mon, 12 Jan 2004, Don Lewis wrote:

> 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.

Hm, I can attempt to reproduce this on 5.2-rel or -current. Can you
provide the options used to iozone?

Doug White                    |  FreeBSD: The Power to Serve
dwhite at          |

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