From: Stephen Hemminger <shemminger@vyatta.com>
To: David Miller <davem@davemloft.net>
Cc: eric.dumazet@gmail.com, rick.jones2@hp.com,
herbert@gondor.apana.org.au, netdev@vger.kernel.org,
jesse@nicira.com
Subject: Re: [RFC] napi: limit GRO latency
Date: Mon, 8 Oct 2012 12:12:48 -0700 [thread overview]
Message-ID: <20121008121248.783e6dc4@nehalam.linuxnetplumber.net> (raw)
In-Reply-To: <20121008.151035.1665672334154033755.davem@davemloft.net>
On Mon, 08 Oct 2012 15:10:35 -0400 (EDT)
David Miller <davem@davemloft.net> wrote:
> From: Stephen Hemminger <shemminger@vyatta.com>
> Date: Mon, 8 Oct 2012 11:58:35 -0700
>
> > Limit the latency of pending GRO in NAPI processing to 2*HZ.
> > When the system is under heavy network load, NAPI will go into
> > poll mode via soft irq, and only stay in the loop for
> > two jiffies. If this occurs, process the GRO pending list
> > to make sure and not delay outstanding TCP frames for too long.
> >
> > Rearrange the exit path to get rid of unnecessary goto logic.
> >
> > Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
>
> Did you see Eric's patch I just applied which limits it to 1ms?
Think this is a different problem.
After leaving softirq, it may be a long time until
ksoftirqd is run which is a different problem.
next prev parent reply other threads:[~2012-10-08 19:13 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-27 12:48 [PATCH net-next 3/3] ipv4: gre: add GRO capability Eric Dumazet
2012-09-27 17:52 ` Jesse Gross
2012-09-27 18:08 ` Eric Dumazet
2012-09-27 18:19 ` Eric Dumazet
2012-09-27 22:03 ` Jesse Gross
2012-09-28 14:04 ` Eric Dumazet
2012-10-01 20:56 ` Jesse Gross
2012-10-05 14:52 ` [RFC] GRO scalability Eric Dumazet
2012-10-05 18:16 ` Rick Jones
2012-10-05 19:00 ` Eric Dumazet
2012-10-05 19:35 ` Rick Jones
2012-10-05 20:06 ` Eric Dumazet
2012-10-08 16:40 ` Rick Jones
2012-10-08 16:59 ` Eric Dumazet
2012-10-08 17:49 ` Rick Jones
2012-10-08 17:55 ` Eric Dumazet
2012-10-08 17:56 ` Eric Dumazet
2012-10-08 18:58 ` [RFC] napi: limit GRO latency Stephen Hemminger
2012-10-08 19:10 ` David Miller
2012-10-08 19:12 ` Stephen Hemminger [this message]
2012-10-08 19:30 ` Eric Dumazet
2012-10-08 19:40 ` Stephen Hemminger
2012-10-08 19:46 ` Eric Dumazet
2012-10-08 19:21 ` Eric Dumazet
2012-10-08 18:21 ` [RFC] GRO scalability Rick Jones
2012-10-08 18:28 ` Eric Dumazet
2012-10-06 4:11 ` Herbert Xu
2012-10-06 5:08 ` Eric Dumazet
2012-10-06 5:14 ` Herbert Xu
2012-10-06 6:22 ` Eric Dumazet
2012-10-06 7:00 ` Eric Dumazet
2012-10-06 10:56 ` Herbert Xu
2012-10-06 18:08 ` [PATCH] net: gro: selective flush of packets Eric Dumazet
2012-10-07 0:32 ` Herbert Xu
2012-10-07 5:29 ` Eric Dumazet
2012-10-08 7:39 ` Eric Dumazet
2012-10-08 16:42 ` Rick Jones
2012-10-08 17:10 ` Eric Dumazet
2012-10-08 18:52 ` David Miller
2012-09-27 22:03 ` [PATCH net-next 3/3] ipv4: gre: add GRO capability Jesse Gross
2012-10-01 21:04 ` David Miller
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