netdev - Re: [PATCH] firewire: net: rate-limit log spam at transmit failure

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Date:	Sun, 07 Nov 2010 05:26:44 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux1394-devel@...ts.sourceforge.net,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] firewire: net: rate-limit log spam at transmit failure

On Sun, 2010-11-07 at 00:23 +0100, Stefan Richter wrote:
> On  6 Nov, Stefan Richter wrote:
> > Then I tried an XIO2213A card in the AMD PC (again the Intel PC as peer)
> > and got 243 times "failed: 12" i.e. RCODE_BUSY and 81 times "failed: 10"
> > i.e. RCODE_SEND_ERROR during ftp transfer of a >500 MB large file from
> > XIO2213A to FW323.
> 

I also am getting strange results (but very good compared to what I had
recently).

With all your patches, I get very stable TCP and UDP streams from laptop
to desktop at 180~190 Mbits/s.

However, the opposite direction (desktop->laptop) still suffers from
tlabel exhaustion.
I added some printks, and I see, clearly that netif_stop_queue doesn't
always work (probably this is intended?).

If I replace == with >= in inc_queue_packets and similar in
dec_queued_packets, then tlabel exhaustion disappears, and I get ~240
Mbit/s on TCP and UDP.

UDP transfers work quite well, tested for few minutes.
TCP transfers unfortunelly trigger (probably a hardware) bug in notebook
OHCI controller (I have seen that meny times so far.)

Transfer just stops, and controller goes south.
If I unload the firewire-ohci, then when I load it:

[ 2062.632532] firewire_ohci 0000:07:00.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
[ 2072.650173] firewire_ohci: Failed to reset ohci card.
[ 2072.650267] firewire_ohci 0000:07:00.0: PCI INT A disabled
[ 2072.650314] firewire_ohci: probe of 0000:07:00.0 failed with error -16

Only suspend to ram helps bring it back from that state.

Best regards,
	Maxim Levitsky

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