Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)

[jamal <hadi@xxxxxxxxxx>]

On Sat, 27 Jan 2001, Ion Badulescu wrote:

>
> 750MHz PIII, Adaptec Starfire NIC, driver modified to use hardware sg+csum
> (both Tx/Rx), and Intel i82559 (eepro100), no hardware csum support,
> vanilla driver.
>
> The box has 512MB of RAM, and I'm using a 100MB file, so it's entirely cached.
>
> starfire:
> 2.4.1-pre10+zerocopy, using sendfile():                9.6% CPU
> 2.4.1-pre10+zerocopy, using read()/write():   18.3%-29.6% CPU         * why 
> so much variance?
>

What are your throughput numbers?

Could you also, please, test using:

http://www.cyberus.ca/~hadi/ttcp-sf.tar.gz

post both sender and receiver data. Repeat each test about
5 times.

cheers,
jamal