From: Pekka Pietikainen <pp@evil.netppl.fi>
To: Jan Kasprzak <kas@informatics.muni.cz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Possible problem with zero-copy TCP and sendfile()
Date: Tue, 17 Apr 2001 21:24:43 +0300 [thread overview]
Message-ID: <20010417212443.A8842@netppl.fi> (raw)
In-Reply-To: <20010417170206.C2589096@informatics.muni.cz> <E14pXxg-0002cI-00@the-village.bc.nu> <20010417181524.E2589096@informatics.muni.cz>
In-Reply-To: <20010417181524.E2589096@informatics.muni.cz>
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
next prev parent reply other threads:[~2001-04-17 18:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-17 13:10 Possible problem with zero-copy TCP and sendfile() Jan Kasprzak
2001-04-17 14:41 ` Andi Kleen
2001-04-17 15:50 ` Jan Kasprzak
[not found] ` <20010417175916.A11824@gruyere.muc.suse.de>
2001-04-17 17:07 ` Jan Kasprzak
2001-04-17 17:40 ` Jan Kasprzak
2001-04-17 14:48 ` Alan Cox
2001-04-17 15:02 ` Jan Kasprzak
2001-04-17 16:04 ` Alan Cox
2001-04-17 16:15 ` Jan Kasprzak
2001-04-17 18:24 ` Pekka Pietikainen [this message]
2001-04-17 20:10 ` Jesse S Sipprell
2001-04-17 20:23 ` David S. Miller
2001-04-17 20:44 ` Jesse S Sipprell
2001-04-17 20:50 ` David S. Miller
2001-04-17 20:36 ` Jan Kasprzak
2001-04-17 21:22 ` Wolfgang Rohdewald
2001-04-17 21:43 ` Martin Josefsson
2001-04-18 6:09 ` Jan Kasprzak
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