From: David Miller <davem@davemloft.net>
To: dada1@cosmosbay.com
Cc: andi@firstfloor.org, netdev@vger.kernel.org, minyard@acm.org,
christian@myri.com
Subject: Re: [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_push_pending_frames()
Date: Mon, 24 Nov 2008 16:07:57 -0800 (PST) [thread overview]
Message-ID: <20081124.160757.167577430.davem@davemloft.net> (raw)
In-Reply-To: <492AB357.1080304@cosmosbay.com>
From: Eric Dumazet <dada1@cosmosbay.com>
Date: Mon, 24 Nov 2008 14:59:51 +0100
> We can reduce pressure on dst entry refcount that slowdown UDP transmit
> path on SMP machines. This pressure is visible on RTP servers when
> delivering content to mediagateways, especially big ones, handling
> thousand of streams. Several cpus send UDP frames to the same
> destination, hence use the same dst entry.
>
> This patch makes ip_push_pending_frames() steal the refcount its
> callers had to take when filling inet->cork.dst.
>
> This doesnt avoid all refcounting, but still gives speedups on SMP,
> on UDP/RAW transmit path.
>
> Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Applied.
next prev parent reply other threads:[~2008-11-25 0:07 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-24 8:57 [RFC] Could we avoid touching dst->refcount in some cases ? Eric Dumazet
2008-11-24 9:42 ` Andi Kleen
2008-11-24 10:14 ` Eric Dumazet
2008-11-24 11:24 ` [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_append_data() Eric Dumazet
2008-11-24 13:59 ` [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_push_pending_frames() Eric Dumazet
2008-11-25 0:07 ` David Miller [this message]
2008-11-24 23:55 ` [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_append_data() David Miller
2008-11-25 2:22 ` Andi Kleen
2008-11-24 11:27 ` [RFC] Could we avoid touching dst->refcount in some cases ? Andi Kleen
2008-11-24 23:36 ` David Miller
2008-11-24 23:39 ` David Miller
2008-11-25 4:43 ` Eric Dumazet
2008-11-25 5:00 ` David Miller
2008-11-26 0:00 ` [PATCH] net: release skb->dst in sock_queue_rcv_skb() Eric Dumazet
2008-11-26 0:23 ` David Miller
2008-11-26 2:04 ` David Miller
2008-11-26 7:39 ` Eric Dumazet
2008-11-26 9:08 ` David Miller
2008-12-17 11:25 ` net-next: broken IP_PKTINFO [was Re: [PATCH] net: release skb->dst in sock_queue_rcv_skb()] Mark McLoughlin
2008-12-18 3:34 ` net-next: broken IP_PKTINFO David Miller
2008-12-18 5:59 ` Eric Dumazet
2008-12-18 6:17 ` David Miller
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=20081124.160757.167577430.davem@davemloft.net \
--to=davem@davemloft.net \
--cc=andi@firstfloor.org \
--cc=christian@myri.com \
--cc=dada1@cosmosbay.com \
--cc=minyard@acm.org \
--cc=netdev@vger.kernel.org \
/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).