Re: NFS flakiness since _at_ last Friday

    0n Wed, Dec 22, 2004 at 08:29:41PM -0600, Conrad J. Sabatier wrote: 

    >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.
    

What is the "new direct i/o mode for nfs" all about ?

 - aW