Re: Possible problem with zero-copy TCP and sendfile()

Pekka Pietikainen
2001-04-17T18:25:06Z

On Tue, Apr 17, 2001 at 06:15:24PM +0200, Jan Kasprzak wrote:
> Some more progress: I now downgraded to proftpd without sendfile().
> The CPU usage is now nearly 100% (with ~170 FTP users; with sendfile()
> it was under 50% with >320 FTP users). But nevertheless, the downloaded
> images now seem to be OK.
>
> Should I try the stock 2.4.3 without zero-copy patches?
It might also be useful to try 2.4.3+zc with the dev->features |=
NETIF_F_SG; in the 3c59x driver taken out (so it won't use zero-copy)

Since it starts from the beginning instead of corrupting random packets I
doubt it's a hardware problem, though.

--
Pekka Pietikainen