Re: NFS flakiness since _at_ last Friday

On Tue, 21 Dec 2004 05:51:57 -0600, "Conrad J. Sabatier"
<conrads_at_cox.net> wrote:

> I'm seeing some real instability in NFS since approximately last
> Friday. Intermittently, I'm seeing messages such as the following:
> 
> On the client machine:
> 
> Dec 20 23:18:22 dolphin kernel: impossible packet length (1820291)
> from nfs server gateway:/mm
> Dec 21 00:51:47 dolphin kernel: impossible packet length (1746474142)
> from nfs server gateway:/mm
> 
> and
> 
> Dec 21 01:14:41 dolphin kernel: nfs send error 35 for server
> gateway:/mm Dec 21 01:16:33 dolphin kernel: nfs send error 35 for
> server gateway:/mm Dec 21 01:16:38 dolphin kernel: nfs send error 35
> for server gateway:/mm Dec 21 01:16:40 dolphin kernel: nfs server
> gateway:/mm: not responding Dec 21 01:16:43 dolphin kernel: nfs server
> gateway:/mm: is alive again
> 
> On the server machine:
> 
> Dec 20 21:52:48 gateway kernel: nfsd send error 32
> Dec 20 21:57:50 gateway kernel: nfsd send error 32
> Dec 20 22:00:45 gateway kernel: nfsd send error 32
> Dec 20 22:23:29 gateway kernel: nfsd send error 32
> Dec 20 23:18:23 gateway kernel: nfsd send error 32
> 
> Then, ultimately, all NFS communication just breaks down
> altogether until a reboot.
> 
> I'm also seeing "sillyrenames" left behind occasionally in nfs-mounted
> directories.
> 
> There were a couple of nfs-related commits last Thursday, which I
> believe are most likely the culprit, although I don't know which ones
> exactly.

I do believe this problem is related to the new direct i/o mode for nfs.
Disabling it seems to have made the problem disappear.

-- 
Conrad J. Sabatier <conrads_at_cox.net> -- "In Unix veritas"