From: Stephen Hemminger <shemminger@vyatta.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>,
eric.dumazet@gmail.com, pstaszewski@itcare.pl,
netdev@vger.kernel.org
Subject: Re: [PATCH] dst: call cond_resched() in dst_gc_task()
Date: Mon, 8 Feb 2010 15:50:53 -0800 [thread overview]
Message-ID: <20100208155053.4ad68484@nehalam> (raw)
In-Reply-To: <20100208153744.236158aa.akpm@linux-foundation.org>
On Mon, 8 Feb 2010 15:37:44 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:
> On Mon, 08 Feb 2010 15:34:06 -0800 (PST)
> David Miller <davem@davemloft.net> wrote:
>
> > From: Andrew Morton <akpm@linux-foundation.org>
> > Date: Mon, 8 Feb 2010 15:26:06 -0800
> >
> > > I assume that this function spends most of its time walking over busy
> > > entries? Is a more powerful data structure needed?
> >
> > When you're getting pounded with millions of packets per second,
> > all mostly to different destinations (and thus resolving to
> > different routing cache entries), this is what happens.
> >
> > For a busy router, really, this is normal behavior.
>
> Is the cache a net win in that scenario?
No, cache doesn't help.
Robert who is the expert in this area, runs with FIB TRIE and
no routing cache.
next prev parent reply other threads:[~2010-02-08 23:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-08 13:16 Problem wit route cache Paweł Staszewski
2010-02-08 13:28 ` Eric Dumazet
2010-02-08 13:33 ` Paweł Staszewski
2010-02-08 13:51 ` Eric Dumazet
2010-02-08 13:59 ` Paweł Staszewski
2010-02-08 14:06 ` Eric Dumazet
2010-02-08 14:16 ` Paweł Staszewski
2010-02-08 14:32 ` Eric Dumazet
2010-02-08 19:32 ` [PATCH] dst: call cond_resched() in dst_gc_task() Eric Dumazet
2010-02-08 23:01 ` David Miller
2010-02-09 6:07 ` Eric Dumazet
2010-02-08 23:26 ` Andrew Morton
2010-02-08 23:34 ` David Miller
2010-02-08 23:37 ` Andrew Morton
2010-02-08 23:50 ` David Miller
2010-02-08 23:50 ` Stephen Hemminger [this message]
2010-02-09 6:06 ` Eric Dumazet
2010-02-09 6:35 ` Andrew Morton
2010-02-09 7:20 ` Eric Dumazet
2010-02-09 7:31 ` Andrew Morton
2010-02-08 14:32 ` Problem wit route cache Paweł Staszewski
2010-02-08 14:45 ` Paweł Staszewski
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=20100208155053.4ad68484@nehalam \
--to=shemminger@vyatta.com \
--cc=akpm@linux-foundation.org \
--cc=davem@davemloft.net \
--cc=eric.dumazet@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=pstaszewski@itcare.pl \
/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).