netdev - Re: Strange packet drops with heavy firewalling

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Date:	Tue, 13 Apr 2010 07:56:26 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Benny Amorsen <benny+usenet@...rsen.dk>,
	zhigang gong <zhigang.gong@...il.com>, netdev@...r.kernel.org
Subject: Re: Strange packet drops with heavy firewalling

Le mardi 13 avril 2010 à 07:18 +0800, Changli Gao a écrit :
> On Tue, Apr 13, 2010 at 1:06 AM, Benny Amorsen <benny+usenet@...rsen.dk> wrote:
> >
> >  99:         24    1306226          3          2   PCI-MSI-edge      eth1-tx-0
> >  100:      15735    1648774          3          7   PCI-MSI-edge      eth1-tx-1
> >  101:          8         11          9    1083022   PCI-MSI-edge      eth1-tx-2
> >  102:          0          0          0          0   PCI-MSI-edge      eth1-tx-3
> >  103:         18         15       6131    1095383   PCI-MSI-edge      eth1-rx-0
> >  104:        217         32      46544    1335325   PCI-MSI-edge      eth1-rx-1
> >  105:        154    1305595        218         16   PCI-MSI-edge      eth1-rx-2
> >  106:         17         16       8229    1467509   PCI-MSI-edge      eth1-rx-3
> >  107:          0          0          1          0   PCI-MSI-edge      eth1
> >  108:          2         14         15    1003053   PCI-MSI-edge      eth0-tx-0
> >  109:       8226    1668924        478        487   PCI-MSI-edge      eth0-tx-1
> >  110:          3    1188874         17         12   PCI-MSI-edge      eth0-tx-2
> >  111:          0          0          0          0   PCI-MSI-edge      eth0-tx-3
> >  112:        203        185       5324    1015263   PCI-MSI-edge      eth0-rx-0
> >  113:       4141    1600793        153        159   PCI-MSI-edge      eth0-rx-1
> >  114:      16242    1210108        436       3124   PCI-MSI-edge      eth0-rx-2
> >  115:        267       4173      19471    1321252   PCI-MSI-edge      eth0-rx-3
> >  116:          0          1          0          0   PCI-MSI-edge      eth0
> >
> >
> > irqbalanced seems to have picked CPU1 and CPU3 for all the interrupts,
> > which to my mind should cause the same problem as before (where CPU1 and
> > CPU3 was handling all packets). Yet the box clearly works much better
> > than before.
> 
> irqbalanced? I don't think it can work properly. Try RPS in netdev and
> linux-next tree, and if cpu load isn't even, try this patch:
> http://patchwork.ozlabs.org/patch/49915/ .
> 
> 

Dont try RPS on multiqueue devices !

If number of queues matches CPU numbers, it brings nothing but extra
latencies !

Benny, I am not sure your irqbalance is up2date with multiqueue devices,
you might need to disable it and manually irqaffine each interrupt

echo 01 >/proc/irq/100/smp_affinity
echo 02 >/proc/irq/101/smp_affinity
echo 04 >/proc/irq/102/smp_affinity
echo 08 >/proc/irq/103/smp_affinity
echo 10 >/proc/irq/104/smp_affinity
echo 20 >/proc/irq/105/smp_affinity
echo 40 >/proc/irq/106/smp_affinity
echo 80 >/proc/irq/107/smp_affinity

echo 01 >/proc/irq/108/smp_affinity
echo 02 >/proc/irq/109/smp_affinity
echo 04 >/proc/irq/110/smp_affinity
echo 08 >/proc/irq/111/smp_affinity
echo 10 >/proc/irq/112/smp_affinity
echo 20 >/proc/irq/113/smp_affinity
echo 40 >/proc/irq/114/smp_affinity
echo 80 >/proc/irq/115/smp_affinity


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