From: Jeff Garzik <jgarzik@pobox.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>,
thomas.spatzier@de.ibm.com, netdev@oss.sgi.com
Subject: Re: [PATCH] select appropriate skb size in tcp_sendmsg when TSO is used
Date: Tue, 26 Oct 2004 20:15:31 -0400 [thread overview]
Message-ID: <20041027001531.GA29973@havoc.gtf.org> (raw)
In-Reply-To: <20041027000724.GA4869@gondor.apana.org.au>
On Wed, Oct 27, 2004 at 10:07:24AM +1000, Herbert Xu wrote:
> On Tue, Oct 26, 2004 at 07:54:35PM -0400, Jeff Garzik wrote:
> > Herbert Xu wrote:
> > >+static int __ethtool_set_sg(struct net_device *dev, u32 data)
> > >+{
> > >+ int err;
> > >+
> > >+ if (!data && dev->ethtool_ops->set_tso) {
> > >+ err = dev->ethtool_ops->set_tso(dev, 0);
> > >+ if (err)
> > >+ return err;
> > >+ }
> > >+
> > >+ return dev->ethtool_ops->set_sg(dev, data);
> > >+}
> >
> > you want to disable tx-csum also
>
> IMHO it is valid to disable SG without disabling checksums, no?
It's useless: The packet header is always in a separate memory
location from the packet data, when using zerocopy sendfile(2).
When not using zerocopy sendfile, you are copying the data _anyway_.
Jeff
next prev parent reply other threads:[~2004-10-27 0:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OF96546AB5.ACE12043-ONC1256F33.0027BC6B-C1256F33.002D4A6E@de.ibm.com>
[not found] ` <E1CKE5P-0005SP-00@gondolin.me.apana.org.au>
[not found] ` <20041020163510.6d13e9c7.davem@davemloft.net>
2004-10-26 11:19 ` [PATCH] select appropriate skb size in tcp_sendmsg when TSO is used Herbert Xu
2004-10-26 23:51 ` Herbert Xu
2004-10-26 23:54 ` Jeff Garzik
2004-10-27 0:07 ` Herbert Xu
2004-10-27 0:03 ` David S. Miller
2004-10-27 1:41 ` Herbert Xu
2004-10-27 0:15 ` Jeff Garzik [this message]
2004-10-27 0:22 ` Herbert Xu
2004-10-27 0:55 ` David S. Miller
2004-10-28 4:16 ` Jeff Garzik
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20041027001531.GA29973@havoc.gtf.org \
--to=jgarzik@pobox.com \
--cc=davem@davemloft.net \
--cc=herbert@gondor.apana.org.au \
--cc=netdev@oss.sgi.com \
--cc=thomas.spatzier@de.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).