netdev - Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86) and e1000e

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Date:	Sat, 19 May 2012 05:29:58 +0300
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	Tom Herbert <therbert@...gle.com>
Cc:	<netdev@...r.kernel.org>, <e1000-devel@...ts.sourceforge.net>,
	<jeffrey.t.kirsher@...el.com>, <jesse.brandeburg@...el.com>,
	<eric.dumazet@...il.com>, <davem@...emloft.net>
Subject: Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86)
 and e1000e

>
> Not expected, we've be running e1000e with BQL for a while.  A few 
> questions:
>
> 1) What kernel are you running?
> 2) What sort of traffic load are you using?
> 3) Have you tried a different interrupt mode?
>
1)Tested 3.3, 3.3.6, 3.4-rc7.
2)Easy to reproduce:

)Open 3 ssh consoles to server with problems
)First console "ping -s1472 -i0.0001 nearby.ip" (It will help to 
trigger problem quickier)
)Second console "ping -s1472 -i0.1 nearby.ip" (Easy to see when network 
stalls - ping rise to 1000-2000ms)
)Open some large text file and scroll it down. After while you will 
feel it "stalls" and just switch to second
console to check if ping risen recently.

It was occured also on loaded NAT server, after i remove shaper from 
it, that was limiting traffic to 350Mbps,
but there traffic pattern much more complicated.

3)Not yet, i run it with default parameters. I will try now.

---
Denys Fedoryshchenko, Network Engineer, Virtual ISP S.A.L.
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