lkml.org 
[lkml]   [2002]   [Oct]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RESEND] tuning linux for high network performance?
On Wed, Oct 23, 2002 at 03:42:48PM +0200, Roy Sigurd Karlsbakk wrote:
> > The e1000 can very well do hardware checksumming on transmit.
> >
> > The missing piece of the puzzle is that his application is not
> > using sendfile(), without which no transmit checksum offload
> > can take place.
>
> As far as I've understood, sendfile() won't do much good with large files. Is
> this right?

I still refuse to believe that a 1.8GHz Pentium4 can only checksum
250megabits/second. MD Raid5 does better and they probably don't use a
checksum as braindead as that used by TCP.

If the checksumming is not the problem, the copying is, which would be a
weakness of your hardware. The function profiled does both the copying and
the checksumming.

But 250megabits/second also seems low.

Dave?

Regards,

bert

--
http://www.PowerDNS.com Versatile DNS Software & Services
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:30    [W:0.078 / U:0.160 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site