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SubjectStill not sexy! (Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)


On Mon, 29 Jan 2001, Ion Badulescu wrote:

> On Mon, 29 Jan 2001, jamal wrote:
>
> > > 11.5kBps, quite consistently.
> >
> > This gige card is really sick. Are you sure? Please double check.
>
> Umm.. the starfire chipset is 100Mbit only. So 11.5MBps (sorry, that was a
> typo, it's mega not kilo) is really all I'd expect out of it.
>

not good.

So far all the tests have been around CPU. The general trend seems
to be:
- sendfile + ZC good for CPU
- write() + ZC not good for CPU
(i might have forgotten something from Andrew's results).
This happens (even with my bogus cpu measure) to be similar.
That seems to be explainable.

** I reported that there was also an oddity in throughput values,
unfortunately since no one (other than me) seems to have access
to a gige cards in the ZC list, nobody can confirm or disprove
what i posted. Here again as a reminder:

Kernel | tput | sender-CPU | receiver-CPU |
-------------------------------------------------
2.4.0-pre3 | 99MB/s | 87% | 23% |
NSF | | | |
-------------------------------------------------
2.4.0-pre3 | 86MB/s | 100% | 17% |
SF | | | |
-------------------------------------------------
2.4.0-pre3 | 66.2 | 60% | 11% |
+ZC | MB/s | | |
-------------------------------------------------
2.4.0-pre3 | 68 | 8% | 8% |
+ZC SF | MB/s | | |
-------------------------------------------------

Just ignore the CPU readings, focus on throughput. And could someone plese
post results?

cheers,
jamal



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