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SubjectRe: Still not sexy! (Re: sendfile+zerocopy: fairly sexy (nothing to dowith ECN)


On Tue, 30 Jan 2001, Rick Jones wrote:

> > ** 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?
>
> In the spirit of the socratic method :)

;->

>
> Is your gige card based on Alteon?

Yes, sir, it is. To be precise:

** Sender: SMP-PII-450Mhz, ASUS m/board; 3com version of acenic
- 1M version
** receiver: same hardware; acenic alteon card - 1M version

> How does ZC/SG change the nature of the packets presented to the NIC?

what do you mean? I am _sure_ you know how SG/ZC work. So i am suspecting
more than socratic view on life here. Could be influence from Aristotle;->

> How well does the NIC do with that changed nature?
>

Hard question to answer ;-> I havent done any analysis at that level

cheers,
jamal

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