From: "Wendy Cheng" <s_wendy_cheng@hotmail.com>
Subject: Re: question on sk_sem within svc_sendto
Date: Wed, 30 Apr 2003 11:53:11 -0400
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To: "Trond Myklebust" <trond.myklebust@fys.uio.no>
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This makes sense (for me) in TCP case but how about
UDP ? Does the 2.5.x kernel send multiple NFS UDP 
packets within one reply (for one single request) ?

Wendy

----- Original Message ----- 
From: "Trond Myklebust" <trond.myklebust@fys.uio.no>
To: "Wendy Cheng" <s_wendy_cheng@hotmail.com>
Cc: <nfs@lists.sourceforge.net>
Sent: Wednesday, April 30, 2003 11:30 AM
Subject: Re: [NFS] question on sk_sem within svc_sendto


| >>>>> " " == Wendy Cheng <s_wendy_cheng@hotmail.com> writes:
| 
|      > We're in the middle of fine-tuning our linux-based file server
|      > and currently examining the NFS zero-copy path with 2.5.x
|      > kernel. There is a semaphore (sk_sem) within svc_sendto() that
|      > serializes the outgoing data. Could someone shed some light and
|      > give us an explanation why this semaphore is needed - just for
|      > education purpose.Great thanks...
| 
| You need to send one datagram at a time down each socket otherwise the
| client might receive data which is partially from one request,
| partially from another.
| 
| Cheers,
|   Trond
| 


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