[BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s
Willy Tarreau
w at 1wt.eu
Mon Nov 18 05:51:50 EST 2013
Hi Thomas,
On Mon, Nov 18, 2013 at 11:26:01AM +0100, Thomas Petazzoni wrote:
> I haven't read the entire discussion yet, but do you guys have
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/clk/mvebu?id=1022c75f5abd3a3b25e679bc8793d21bedd009b4
> applied? It got merged recently, and it fixes a number of networking
> problems on Armada 370.
No, because my version was even older than the code which introduced this
issue :-)
The main issue is related to something we discussed once ago which surprized
both of us, the use of a Tx timer to release the Tx descriptors. I remember
I considered that it was not a big issue because the flush was also done in
the Rx path (thus on ACKs) but I can't find trace of this code so my analysis
was wrong. Thus we can hit some situations where we fill the descriptors
before filling the link.
Ideally we should have a Tx IRQ. At the very least we should call the tx
refill function in mvneta_poll() I believe. I can try to do it but I'd
rather have the Tx IRQ working instead.
Regards,
Willy
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