From: Dmitry Yusupov <dima@s2io.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: "Rajat Jain, Noida" <rajatj@noida.hcltech.com>,
linux-newbie@vger.kernel.org, linux-net@vger.kernel.org,
linux-kernel@vger.kernel.org, kernelnewbies@nl.linux.org,
"Sanjay Kumar, Noida" <sanjayku@hcltech.com>,
"Deepak Kumar Gupta, Noida" <dkumar@hcltech.com>
Subject: Re: zero copy issue while receiving the data (counter part of sen dfil e)
Date: Tue, 21 Dec 2004 11:43:10 -0800 [thread overview]
Message-ID: <1103658190.7217.121.camel@beastie> (raw)
In-Reply-To: <41C879CB.3040600@pobox.com>
indeed :)
another words if you have modern NIC than you get "zero-copy"(except
copy_to_user()) for free :)
Regards,
Dima
On Tue, 2004-12-21 at 14:30 -0500, Jeff Garzik wrote:
> Dmitry Yusupov wrote:
> > Rajat,
> >
> > small correction, if NIC supports DMA operation on receive, than no
> > extra copy required. Therefore sock_recvmsg() and tcp_read_sock
>
> large correction: if NIC supports _checksum_ on receive, then no extra
> copy is required.
>
> Jeff
>
next prev parent reply other threads:[~2004-12-21 19:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-21 16:35 zero copy issue while receiving the data (counter part of sen dfil e) Rajat Jain, Noida
2004-12-21 17:22 ` Dmitry Yusupov
2004-12-21 19:30 ` Jeff Garzik
2004-12-21 19:43 ` Dmitry Yusupov [this message]
2004-12-22 8:21 ` zero copy issue while receiving the data (counter part of sendfil e) Mandeep Sandhu
2004-12-22 15:50 ` Martijn van Oosterhout
2004-12-22 16:06 ` John W. Linville
-- strict thread matches above, loose matches on Subject: below --
2004-12-17 16:24 zero copy issue while receiving the data (counter part of sen dfil e) Rajat Jain, Noida
2004-12-17 17:31 ` Dmitry Yusupov
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