netdev - Re: Extremely bad performance with RTL8111/8168B

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Message-ID: <20130709002454.GA20613@amd.pavel.ucw.cz>
Date:	Tue, 9 Jul 2013 02:24:54 +0200
From:	Pavel Machek <pavel@....cz>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Hayes Wang <hayeswang@...ltek.com>, netdev@...r.kernel.org
Subject: Re: Extremely bad performance with RTL8111/8168B

Hi!

> pavel@amd:~$ scp /tmp/delme pavel@duo:/tmp
> pavel@...'s password: 
> delme                                         100%   34MB 481.1KB/s   01:12    
> 
> Aha. I see abnormal ping times from duo to amd. (Cca 80msec range.)
> amd has e1000e card, and apparently its interrupt does not
> work. Fortunately it is shared with ahci so I can work around that
> one... and when I do, transfer gets even slower. Hmm?

I verified that copy is slow even from Elf to duo. Elf is old desktop,
and its ethernet card is working correctly, AFAICT.

Copy is even slower from Elf->duo, cca 66KB/sec. It is also slower
when I work around interrupt problems on amd, amd->duo is then cca
200KB/sec.

IOW yes amd's e1000e has a problem, but duo's realtek has even bigger
problem.

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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