From: Eric Dumazet <eric.dumazet@gmail.com>
To: Denys Fedoryshchenko <denys@visp.net.lb>
Cc: Tom Herbert <therbert@google.com>, netdev@vger.kernel.org
Subject: Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86) and e1000e
Date: Tue, 22 May 2012 19:24:57 +0200 [thread overview]
Message-ID: <1337707497.3361.233.camel@edumazet-glaptop> (raw)
In-Reply-To: <eb8cdd693530010d6736baede0cfebd8@visp.net.lb>
On Tue, 2012-05-22 at 20:11 +0300, Denys Fedoryshchenko wrote:
> By the way, if BQL limit is going lower than MTU, is it considered as a
> bug?
> If yes, i can try to upload 3.4 to some servers and add condition to
> WARN_ON if limit < 1500.
There is no problem with BQL limit going lower than the max packet size.
(With TSO it can be 64K)
Remember BQL allows one packet to be sent to device, regardless of its
size.
Next packet might be blocked/stay in Qdisc
If your workload is mostly idle, but sending bursts of 3 packets, then
only one is immediately sent.
Next packets shall wait the TX completion of first packet.
next prev parent reply other threads:[~2012-05-22 17:25 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-15 14:15 Strange latency spikes/TX network stalls on Sun Fire X4150(x86) and e1000e Denys Fedoryshchenko
2012-05-17 13:42 ` Denys Fedoryshchenko
2012-05-17 16:54 ` Denys Fedoryshchenko
2012-05-18 14:04 ` Denys Fedoryshchenko
2012-05-19 2:07 ` Tom Herbert
2012-05-19 2:29 ` Denys Fedoryshchenko
2012-05-19 2:40 ` Denys Fedoryshchenko
2012-05-20 17:40 ` Tom Herbert
2012-05-20 18:53 ` Denys Fedoryshchenko
2012-05-20 19:07 ` Eric Dumazet
2012-05-20 19:18 ` Denys Fedoryshchenko
2012-05-21 3:56 ` Eric Dumazet
2012-05-21 8:06 ` Denys Fedoryshchenko
2012-05-21 8:30 ` Eric Dumazet
2012-05-21 8:40 ` Eric Dumazet
2012-05-21 9:22 ` Denys Fedoryshchenko
2012-05-22 17:11 ` Denys Fedoryshchenko
2012-05-22 17:24 ` Eric Dumazet [this message]
2012-05-25 6:01 ` Tom Herbert
2012-05-25 6:22 ` Eric Dumazet
2012-05-25 16:59 ` Tom Herbert
2012-05-25 17:18 ` Eric Dumazet
2012-05-29 14:25 ` Hiroaki SHIMODA
2012-05-29 14:54 ` Tom Herbert
2012-05-29 15:11 ` Eric Dumazet
2012-05-29 19:52 ` Denys Fedoryshchenko
2012-05-30 0:06 ` Hiroaki SHIMODA
2012-05-30 8:40 ` Eric Dumazet
2012-05-30 10:43 ` Hiroaki SHIMODA
2012-05-30 11:08 ` Eric Dumazet
2012-05-30 11:20 ` Joe Perches
2012-05-30 11:59 ` Eric Dumazet
2012-05-30 14:09 ` Joe Perches
2012-05-30 14:42 ` Eric Dumazet
2012-05-30 14:50 ` Joe Perches
2012-05-30 11:29 ` Hiroaki SHIMODA
2012-05-30 14:49 ` Eric Dumazet
2012-05-30 15:00 ` dave taht
2012-05-30 22:19 ` Hiroaki SHIMODA
2012-05-30 10:52 ` David Laight
2012-05-30 11:04 ` Eric Dumazet
2012-05-30 11:12 ` Eric Dumazet
2012-06-06 5:10 ` Eric Dumazet
2012-06-06 8:43 ` Hiroaki SHIMODA
2012-06-06 16:26 ` Jesse Brandeburg
2012-06-06 17:05 ` Eric Dumazet
2012-06-06 17:26 ` David Miller
2012-06-06 17:19 ` Hiroaki SHIMODA
2012-06-06 18:21 ` Tom Herbert
2012-06-06 18:23 ` David Miller
2012-06-06 18:46 ` Stephen Hemminger
2012-05-20 18:13 ` Eric Dumazet
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