From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: davem@davemloft.net, johaahn@gmail.com, netdev@vger.kernel.org
Subject: Re: [PATCH] sendfile() and UDP socket
Date: Tue, 23 Sep 2008 11:07:58 +0400 [thread overview]
Message-ID: <20080923070758.GD25231@2ka.mipt.ru> (raw)
In-Reply-To: <20080923070133.GB26836@gondor.apana.org.au>
On Tue, Sep 23, 2008 at 03:01:33PM +0800, Herbert Xu (herbert@gondor.apana.org.au) wrote:
> Yes but bulk transfers over UDP is a bad idea regardless of how
> slow your bus is :)
It still deserves living if it is not highly priority traffic like video
dataflow.
> So what application needs this?
Johann did not show his exact usage scenario, but from what I got I
concluded, that it is kind of a video sensor (or some other data which
is allowed to be lost), which has to add a header
to the frame and submit it to the network without any copy because of
hardware limitation for the memory bus. Sensor can put data via DMA to
the needed location. His first (and parallel to this one) idea was to
extend packet socket to allow send of the mapped data.
I proposed to do the same with sendfile, i.e. dma data to the mapped
area of some file in the ramdisk, add header, do it for multiple frames
and then send given file using sendfile().
--
Evgeniy Polyakov
next prev parent reply other threads:[~2008-09-23 7:08 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-14 10:25 [PATCH] sendfile() and UDP socket Johann Baudy
2008-09-16 4:17 ` Simon Horman
2008-09-16 4:24 ` Simon Horman
2008-09-16 12:01 ` Hirokazu Takahashi
2008-09-18 17:31 ` Rémi Denis-Courmont
2008-09-19 12:28 ` Hirokazu Takahashi
2008-09-19 13:14 ` Rémi Denis-Courmont
2008-09-21 8:04 ` David Miller
2008-09-22 0:21 ` Evgeniy Polyakov
2008-09-22 0:44 ` David Miller
2008-09-22 1:08 ` Evgeniy Polyakov
2008-09-22 2:07 ` David Miller
2008-09-22 4:19 ` Evgeniy Polyakov
2008-09-22 4:27 ` David Miller
2008-09-22 4:40 ` Evgeniy Polyakov
2008-09-22 5:06 ` David Miller
2008-09-22 5:49 ` Evgeniy Polyakov
2008-09-22 6:54 ` David Miller
2008-09-22 7:04 ` Evgeniy Polyakov
2008-09-23 4:54 ` Herbert Xu
2008-09-23 6:27 ` Evgeniy Polyakov
2008-09-23 7:01 ` Herbert Xu
2008-09-23 7:07 ` Evgeniy Polyakov [this message]
2008-09-24 4:53 ` Bill Fink
[not found] ` <7e0dd21a0810140009k49c8876ax66f744d0a3a4931b@mail.gmail.com>
2008-10-14 7:10 ` Johann Baudy
2008-09-25 13:03 ` Using skb_get() to recycle skbs Ram.Natarajan
2008-09-25 14:28 ` Evgeniy Polyakov
-- strict thread matches above, loose matches on Subject: below --
2008-09-10 12:39 [PATCH] sendfile() and UDP socket Johann Baudy
2008-09-10 20:16 ` David Miller
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