Messages in this thread |  | | Subject | Re: zero-copy TCP | From | Jes Sorensen <> | Date | 04 Sep 2000 17:20:24 +0200 |
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>>>>> "Ingo" == Ingo Molnar <mingo@elte.hu> writes:
Ingo> On Mon, 4 Sep 2000 kumon@flab.fujitsu.co.jp wrote:
>> The experiment showed the following prefetching could reduce 20-30% >> of csum_partial_copy_generic() execution time.
Ingo> Please test it and post the numbers. csum_partial_copy_generic() Ingo> already does prefetching - the real test would be to check Ingo> lat_tcp and bw_tcp numbers over gigabit, with and without this Ingo> patch applied. (the same numbers over localhost dont really Ingo> count.) Eg. we had smart KNI-based memcpy routines as well, and Ingo> it turned out that bw_tcp over gigabit actually got Ingo> slower. [testing over 100mbit isnt enough obviously because x86 Ingo> CPUs csum much faster than that.]
Thats a surprise to me, I remember better performance when I played with Doug's KNI patches back in the beginning.
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