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SubjectRe: Is sendfile all that sexy?


On Sun, 14 Jan 2001, Ingo Molnar wrote:

>
> in this case there could still be valid performance differences, as
> copying from user-space is cheaper than copying from the pagecache. To
> rule out SMP interactions, you could try a UP-IOAPIC kernel on that box.
>

Let me complete this with the ZC patches first. then i'll do that.
There are a few retarnsmits; maybe receiver IRQ affinity might help some.

> (I'm also curious what kind of numbers you'll get with the zerocopy
> patch.)

Working on it.

> no, in the case of a single thread this should have minimum impact. But
> i'd suggest to increase the /proc/sys/net/tcp*mem* values (to 1MB or
> more).

The upper thresholds to 1000000 ?
I should have mentioned that i set /proc/sys/net/core/*mem*
to currently 262144.

cheers,
jamal

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