Performance problems with NFS under 2.4.20

[Lars Magne Ingebrigtsen <larsi _at_ xxxxxxxx>]

Upgrading from 2.2.20, I'm seeing vastly increased network traffic,
and after poking around a bit, I find that all calls to open() on
files on NFS-mounted partitions generates one UDP packet.  Switching
on NFS debugging, and then saying

$ cat file
$ cat file

shows me this:

Jan 13 16:27:23 litos kernel: NFS: refresh_inode(b/876609548 ct=1 info=0x2)
Jan 13 16:27:23 litos kernel: nfs: read(//file, 4096 _at_ 0)
Jan 13 16:27:23 litos kernel: nfs: read(//file, 4096 _at_ 17)
Jan 13 16:27:23 litos kernel: nfs: flush(b/876609548)
Jan 13 16:27:23 litos kernel: NFS: dentry_delete(//file, 0)
Jan 13 16:27:24 litos kernel: NFS: refresh_inode(b/876609548 ct=1 info=0x2)
Jan 13 16:27:24 litos kernel: nfs: read(//file, 4096 _at_ 0)
Jan 13 16:27:24 litos kernel: nfs: read(//file, 4096 _at_ 17)
Jan 13 16:27:24 litos kernel: nfs: flush(b/876609548)
Jan 13 16:27:24 litos kernel: NFS: dentry_delete(//file, 0)

The partition is mounted with just

$ mount server:/db /db

Adding a "-o actimeo=100" makes no difference.

Is this supposed 1) to be this way, or 2) a bug, or 3) a
misconfiguration on my part?

-- 
(domestic pets only, the antidote for overdose, milk.)
   larsi _at_ gnus.org * Lars Magne Ingebrigtsen

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