lkml.org 
[lkml]   [2006]   [Oct]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: NFS inconsistent behaviour
On Wed, Oct 18, 2006 at 10:22:44AM +0900, Mohit Katiyar wrote:
> I checked it today and when i issued the netstat -t ,I could see a lot
> of tcp connections in TIME_WAIT state.
> Is this a normal behaviour?

yes... but see below

> So we cannot mount and umount infinitely
> with tcp option? Why there are so many connections in waiting state?

I think it's called the 2MSL wait: there may be TCP segments on the
wire which (in theory) could disrupt new connections which reuse local
and remote port so the ports stay in use for a few minutes. This is
standard TCP behavior but only occurs when connections are improperly
shutdown. Apparently this happens when umounting a tcp NFS mount but
also for a lot of other tcp based RPC (showmount, rpcinfo). I'm not
sure who's to blame but it might be the rpc functions inside glibc.

I'd switch to NFS over udp if this is problem.

(cc'ed to nfs mailing list)

--
Frank
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-18 08:43    [W:0.102 / U:22.568 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site