From: Stephen Hemminger <shemminger@vyatta.com>
To: Tom Herbert <therbert@google.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>, netdev@vger.kernel.org
Subject: Re: Receive steering and hash and cache misses
Date: Fri, 2 Apr 2010 11:54:39 -0700 [thread overview]
Message-ID: <20100402115439.348575c9@nehalam> (raw)
In-Reply-To: <g2l65634d661004021059z94214a43v82409d15a0fb09b6@mail.gmail.com>
On Fri, 2 Apr 2010 10:59:43 -0700
Tom Herbert <therbert@google.com> wrote:
> On Fri, Apr 2, 2010 at 10:26 AM, Stephen Hemminger
> <shemminger@vyatta.com> wrote:
> >
> > Although Receive Packet Steering can use a hardware generated receive hash
> > the device driver still causes an unnecessary cache miss on the interrupt
> > processing CPU. The current Ethernet network device driver receive processing
> > has the device driver calling eth_type_trans() which causes a the
> > interrupt CPU to read the received frame header.
> >
>
> It should be possible to deduce the values set by eth_type_trans from
> the RX descriptor along with the RX hash. I'll post the patch getting
> rxhash from bnx2x which does this.
>
On sky2, I get only RSS, Checksum, and length from descriptor info.
next prev parent reply other threads:[~2010-04-02 19:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-02 17:26 Receive steering and hash and cache misses Stephen Hemminger
2010-04-02 17:59 ` Tom Herbert
2010-04-02 18:54 ` Stephen Hemminger [this message]
2010-04-02 19:36 ` Eric Dumazet
2010-04-02 22:52 ` Stephen Hemminger
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=20100402115439.348575c9@nehalam \
--to=shemminger@vyatta.com \
--cc=eric.dumazet@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=therbert@google.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).