From: Matt Porter <mporter@kernel.crashing.org>
To: kernel coder <lhrkernelcoder@gmail.com>
Cc: linux-mips@linux-mips.org
Subject: Re: zero copy
Date: Tue, 6 Dec 2005 08:53:47 -0700 [thread overview]
Message-ID: <20051206085347.A32501@cox.net> (raw)
In-Reply-To: <f69849430512060406x7f30a2f6k2c64f6cef383c175@mail.gmail.com>; from lhrkernelcoder@gmail.com on Tue, Dec 06, 2005 at 04:06:06AM -0800
On Tue, Dec 06, 2005 at 04:06:06AM -0800, kernel coder wrote:
> hi,
> i'm trying to track the code flow of sendfile system call.Mine
> ethernet card doesn't have scatter gather and checksum calculation
> features.So stack should be making a copy of data.
>
> Please tell me where in sendfile code flow,check for scatter gather
> and cecksum features is made so that stack can decide whether to copy
> data from user space or not.
Is your grep really that broken? :)
net/ipv4/tcp.c:tcp_sendpage() is where you find the check and
fallback to sendmsg if you follow it through.
-Matt
next prev parent reply other threads:[~2005-12-06 15:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-06 12:06 zero copy kernel coder
2005-12-06 15:53 ` Matt Porter [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-12-06 12:09 kernel coder
2005-12-06 12:28 ` Steven Whitehouse
2003-02-07 10:04 Emiliano Gabrielli
2003-02-06 23:07 Venkat Raghu
2002-03-12 8:59 Rogier Wolff
2002-03-12 9:07 ` Andi Kleen
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