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Re: kern/37025 (mount_smbfs write performance is <censored>)
The following reply was made to PR kern/37025; it has been noted by GNATS.
From: David Holland <dholland-bugs%netbsd.org@localhost>
Subject: Re: kern/37025 (mount_smbfs write performance is <censored>)
Date: Tue, 23 Mar 2010 17:29:04 +0000
On Tue, Mar 23, 2010 at 01:55:02AM +0000, Martin S. Weber wrote:
> Now where to go from here? I still believe there's a problem here,
> although the situation seriously improved in contrast to the eons
> ago when I first filed this PR.
Kernel profiling or fine-grained timing to figure out where the time
is going? It is likely to be a pain.
> Also the problem with random hangs of the mount persists. I haven't
> seen this happening with smbclient yet, only with a mount_smbfs-mounted
Figuring out whether this is network-related (e.g. stalls due to lost
packets, protocol botches, etc.) or vfs-related (lock
contention/deadlock/etc.) might also be helpful. After all, the
performance problem might be small instances of the same issue...
ps -alx should be enough to diagnose this; look for something that
isn't "tstile". ("tstile" just means "waiting for something else").
David A. Holland
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