[openib-general] Re: FW: SDP problems with 64K page size

[Jerome Pioux]

Okay I will try that too and let you know.
Thank you.
Jerome


----- Original Message ----- 
From: "Michael S. Tsirkin" <mst at mellanox.co.il>
To: "Roland Dreier" <rolandd at cisco.com>
Cc: "Jerome Pioux" <jerome.pioux at bull.com>; "Tom Duffy" 
<thomas.duffy.99 at alumni.brown.edu>; <openib-general at openib.org>
Sent: Monday, September 26, 2005 8:05 PM
Subject: Re: FW: SDP problems with 64K page size


> Quoting r. Roland Dreier <rolandd at cisco.com>:
>> Subject: Re: FW: SDP problems with 64K page size
>>
>>     Jerome> Just an open question: Do you think that we could get
>>     Jerome> better performance if we would go with u32 instead of
>>     Jerome> reducing the buffer to 16K?
>>
>> Not sure.  One easy test you could try would be increasing 16384 to
>> 32768 in my patch.
>
> I would replace 16384 with 4096 instead, and see whether the performance
> decreases. Other approaches need changing more places.
>
>> If that works and improves performance, then
>> further increases would probably be worthwhile also.
>
> My worry would be sign extention kicking in at this point,
> since we are doing math on these numbers.
>
>> You could also try changing recv_size and send_size from u16 to s32 in
>> the declaration in sdp_conn.h.
>
> Some other places need cleaning up for this to work.
>
>> BTW, I say all of this with only the vaguest understanding of the SDP
>> code base, so it might be complete nonsense.
>>
>>  - R.
>>
>
> -- 
> MST