netdev - Re: Strange packet drops with heavy firewalling

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Message-ID: <u2y412e6f7f1004121618p6d6eff30q8a45a03faa59a912@mail.gmail.com>
Date:	Tue, 13 Apr 2010 07:18:42 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Benny Amorsen <benny+usenet@...rsen.dk>
Cc:	zhigang gong <zhigang.gong@...il.com>, netdev@...r.kernel.org
Subject: Re: Strange packet drops with heavy firewalling

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/ .


-- 
Regards，
Changli Gao(xiaosuo@...il.com)