Re: [PATCH 13/15] SUNRPC: RPC buffer size estimates are too large

[Chuck Lever <chuck.lever@oracle.com>]

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J. Bruce Fields wrote:
> On Wed, Jan 24, 2007 at 03:50:37PM -0500, Chuck Lever wrote:
>> I've been running Connectathon and fsx-odirect with hundreds of 
>> thousands of ops on a kernel that has all the slab debugging options 
>> enabled.  I haven't hit a problem yet.
> 
> That's not going to exercise all the possible buffer calculations--it
> probably doesn't perform any ACL operations, for example.
> 
> I wonder if it would be possible to generate those buffer sizes directly
> from the .x files or something?
> 
>> And besides, the RPC buffers are all a fixed size (2kiB), and much 
>> larger than required already.  The slack is "built in" to the buffer size.
> 
> OK.  Do we know of any calls or replies that are close to that limit?

In general the big piece of the call and reply headers are the 
credentials and verifiers.  Every NFS operation that sends or receives a 
large call or reply does so by using the page cache, ACLs included.

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