From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: NFS TCP settings
Date: Tue, 20 Dec 2005 10:47:06 -0500
Message-ID: <1135093627.7955.36.camel@lade.trondhjem.org>
References: <20051220153837.63707.qmail@web34102.mail.mud.yahoo.com>
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Content-Type: text/plain
Cc: nfs@lists.sourceforge.net
To: Kenny Simpson <theonetruekenny@yahoo.com>
In-Reply-To: <20051220153837.63707.qmail@web34102.mail.mud.yahoo.com>
Sender: nfs-admin@lists.sourceforge.net
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On Tue, 2005-12-20 at 07:38 -0800, Kenny Simpson wrote:
> Hello,
>   Why does the Linux NFS client force the rsize ans wsize to be a power of 2, and why is the TCP
> window size equal to the rsize or wsize?

The NFS/RPC code has no direct control over the TCP window size. That
would be an issue for the networking people.

As for the issue of forcing the rsize/wsize to be a power of two, then 2
reasons come to mind:

 1) We want to make it easy to match PAGE_CACHE_SIZE and read/write
request sizes.
 2) server block sizes are usually powers of two.

Cheers,
  Trond


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