netdev - Re: r8169: hard freezes on TX

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Date:	Wed, 23 May 2007 08:21:02 +0200
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org
Subject: Re: r8169: hard freezes on TX

You wrote:
> Rolf Eike Beer <eike-kernel@...tec.de> :
> [...]
>
> > I often see freezes when I do much outgoing transfer. I have never seen
> > this happening on incoming transfers. When this happens the system locks
> > up hard, I don't see anything in the log. Since this is my laptop I have
> > trouble debugging it: there is no serial console and debugging this via
> > netconsole doesn't look like a good idea.
>
> Keyboard leds are dead afterwards I guess, right ?

I'm not absolutely sure but I can do a test later today.

> If you are experiencing bugs related to networking, I suggest to stay
> away from netconsole. It is not funny to analyze several bugs at the same
> time.

I did not expect anything coming through there, last time I tested even pings 
were unanswered. Because of this I didn't even try netconsole.

> > When I say "much outgoing transfer" this means "several megabytes". If I
> > copy out 30 MB I almost everytime get this. I usually copy that much only
> > at home when I feed my gentoo server. That host only has a 10 MBit
> > connection. Nevertheless I've also seen that on different hosts using
> > different files on different protocols (ftp, scp, smb).
> >
> :o/
>
> So it can be reproduced with a simple ftp put of several megabytes of
> data completely cached in memory (no disk access) ?

I can put it into RAM before next test to be absolutely sure.

> > This is the output of lspci for my NIC:
> >
> > 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E PCI
> > Express Fast Ethernet controller (rev 01)
>
> I have not seen a lot of reports for this one. Either it is perfect or
> it is barely used.
>
> [...]
>
> > Hm, is there a reason why we don't use MSI here?
>
> A request for testers was posted (netdev + lk) on 16/03/2007 which
> contained MSI code for the 8168. I did not enable it for the 8101 because
> it had only received (positive) reports from 8168 users.
>
> Afair, the RFT got no feedback.

I'll dig for it.

> > Ah, one thing is missing: I've not tested it with current kernel, latest
> > I tested was 2.6.21-rc7. But I've seen this on many previous version,
> > although I thought it became better some versions ago. I wont bet on it,
> > it might just have been luck.
>
> You can/should try:
> http://www.fr.zoreil.com/linux/kernel/2.6.x/2.6.22-rc2 (patch-kit)
> or:
> http://www.fr.zoreil.com/people/francois/misc/20070522-2.6.22-rc2-r8169.pat
>ch
>
> If you are fluent with git and you do not mind rebasing, you can try
> git://electric-eye.fr.zoreil.com/home/romieu/linux/linux-2.6-out r8169
>
> (don't do the initial clone from here, thanks)
>
> As an option, akpm includes the git branch for you in -mm.

I'll take a look, thanks.

Eike

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