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From: Phillip Susi <psusi@cfl.rr.com>
To: Roy Rietveld <rwm_rietveld@hotmail.com>
Cc: linux-os@analogic.com, linux-kernel@vger.kernel.org
Subject: Re: TCP/IP send, sendfile, RAW
Date: Thu, 04 May 2006 17:21:29 -0400	[thread overview]
Message-ID: <445A7059.7000202@cfl.rr.com> (raw)
In-Reply-To: <BAY105-F38F372575F5B72AF1DACE6E9B40@phx.gbl>

Roy Rietveld wrote:
> I read something about zero copy may i need somelike that.

Yes, zero copy IO does make a huge difference.  Unfortunately, at this 
time, it is not possible to do zero copy IO on sockets save for 
sendfile() because they do not yet support aio, at least, not the last 
time I checked.

For comparison I wrote an ftp server for NT 4.0 several years ago on a 
PII-233 system ( similar speed to yours ) and saw similar results to 
yours until switching to zero copy IO, which pushed 11,820 KB/s ftp 
transfers using less than 1% of the cpu.

I'm still waiting for Linux to be able to do this, and hopefully won't 
have to wait much longer.


  parent reply	other threads:[~2006-05-04 21:22 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-04 17:19 TCP/IP send, sendfile, RAW Roy Rietveld
2006-05-04 17:41 ` Jan Engelhardt
2006-05-04 17:56   ` linux-os (Dick Johnson)
2006-05-04 18:05     ` Roy Rietveld
2006-05-04 18:27       ` linux-os (Dick Johnson)
2006-05-04 18:42         ` Roy Rietveld
2006-05-04 19:12           ` linux-os (Dick Johnson)
2006-05-04 19:43             ` Roy Rietveld
2006-05-04 19:48               ` Willy Tarreau
2006-05-04 21:21               ` Phillip Susi [this message]
2006-05-04 22:22           ` Alan Cox
2006-05-07 14:40       ` Mark Lord
2006-05-05  8:57 ` Denis Vlasenko
     [not found] <445B165D.3000508@draigBrady.com>
2006-05-05  9:39 ` Roy Rietveld
2006-05-05 12:39   ` Avi Kivity
2006-05-05 14:25     ` Roy Rietveld

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