netdev - Re: 3.4.1 and 3.5-rc1 Packet lost at 250Mb/s

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Date:	Mon, 08 Oct 2012 11:47:20 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	adam.niescierowicz@...tnet.pl
Cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: 3.4.1 and 3.5-rc1 Packet lost at 250Mb/s

On Mon, 2012-10-08 at 11:29 +0200, Nieścierowicz Adam wrote:
> >
> > You should use RPS on eth2/eth3 because they are non multi queue.
> >
> > Documentation/networking/scaling.txt should give you all the needed 
> > info
> 
> I set processors for rps such as affinity, unfortunately it did not 
> help
> 
> ---
> cat /sys/class/net/eth{2,3,4,5}/queues/rx-0/rps_cpus
> 0040
> 0080
> 0100
> 0200
> ---
> CPU affinity http://wklej.org/id/843161/
> 
> 

I said eth2 and eth3

And you should use cpu11->cpu15 instead of cpu6->cpu9 since they are in
use...

Anyway you dont say where are drops, (ifconfig give us very few drops)

Also your eth0 seems to have a strange balance :

RX interrupts seems to be well balanced on 4 queues :

76:        503          0  169271690          0          0          0          PCI-MSI-edge      eth0-rx-0
77:        405          0          0  164532538          0          0          PCI-MSI-edge      eth0-rx-1
78:        408          0          0          0  152778723          0          PCI-MSI-edge      eth0-rx-2
79:        349          0          0          0          0  155011301          PCI-MSI-edge      eth0-rx-3
80:        144          0  443432394          0          0          0          PCI-MSI-edge      eth0-tx-0
81:         18          0          0    2043311          0          0          PCI-MSI-edge      eth0-tx-1
82:         30          0          0          0    1934537          0          PCI-MSI-edge      eth0-tx-2
83:        137          0          0          0          0    1968272          PCI-MSI-edge      eth0-tx-3

But TX seems to mostly use queue 0

Packets sent to eth0 are coming from where ?



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