From: Bill Fink <billfink@mindspring.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>,
davem@davemloft.net, johaahn@gmail.com, netdev@vger.kernel.org
Subject: Re: [PATCH] sendfile() and UDP socket
Date: Wed, 24 Sep 2008 00:53:35 -0400 [thread overview]
Message-ID: <20080924005335.0117c536.billfink@mindspring.com> (raw)
In-Reply-To: <20080923070133.GB26836@gondor.apana.org.au>
On Tue, 23 Sep 2008, Herbert Xu wrote:
> On Tue, Sep 23, 2008 at 10:27:10AM +0400, Evgeniy Polyakov wrote:
> > On Tue, Sep 23, 2008 at 12:54:27PM +0800, Herbert Xu (herbert@gondor.apana.org.au) wrote:
> > > I think this dicussion is moot since the only time you want to use
> > > sendfile is for bulk transfers and these days anybody designing new
> > > applications that does bulk transfers over UDP should be taken out
> > > and shot.
> >
> > One can protect himself pointing how slow may be memory bus in some
> > hardware setup, which completely does not allow to perform any copy.
>
> Yes but bulk transfers over UDP is a bad idea regardless of how
> slow your bus is :)
>
> So what application needs this?
It seems it might be useful for a video server. The one thing that
seems to be missing from the sendfile() semantics is a message size
to be used for splitting the file into UDP datagrams, but this could
be provided by a separate ioctl(), and could default to the largest
message size that would fit in the MTU.
-Bill
next prev parent reply other threads:[~2008-09-24 4:54 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
2008-09-24 4:53 ` Bill Fink [this message]
[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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