From: Hirokazu Takahashi <taka@valinux.co.jp>
Subject: Re: Re: [PATCH] zerocopy NFS for 2.5.43
Date: Fri, 25 Oct 2002 18:52:34 +0900 (JST)
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20021025.185234.08315285.taka@valinux.co.jp>
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	<20021018.221103.35656279.taka@valinux.co.jp>
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Cc: nfs@lists.sourceforge.net
To: neilb@cse.unsw.edu.au
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Errors-To: nfs-admin@lists.sourceforge.net

Hello,

> I have been thinking some more about this, trying to understand the
> big picture, and I'm afraid that I think I want some more changes.
> 
> In particular, I think it would be good to use 'struct xdr_buf' from
> sunrpc/xdr.h instead of svc_buf.  This is what the nfs client uses and
> we could share some of the infrastructure.

I just realized it would be hard to use the xdr_buf as it couldn't
handle data in a socket buffer. Each socket burfer consists of
some non-page data and some pages and each of them might have its
own offset and length.

> I'm not certain about receiving write requests.
> I imagine that it might work to:
>   1/ call xdr_partial_copy_from_skb to just copy the first 1K from the
>     skb into the head iovec, and hold onto the skbuf (like we
>     currently do).

And I came up with another idea that kNFSd could handles TCP data
in a socket buffer directly without copy if we can enhancemence the
tcp_read_sock() not to release it while kNFSd is using it.
kNFSd would handle TCP data as if it were a UDP datagram.
The differences are kNFSd may grab some TCP socket buffers at once
and the buffers may be shared to other kNFSd's.

Thank you,
Hirokazu Takahashi.


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