Re: [lvs-users] ksoftirqd 100% Processor Usage

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] ksoftirqd 100% Processor Usage
From: "Mikio Kishi" <mkishi@xxxxxxx>
Date: Mon, 24 Nov 2008 21:56:06 +0900
Hi,  Adrian, Graeme and Thomas

Thank you for really really rapid reply !
What an incredible ML !

> What network card are you using on the director? There's only so many
> interrupts you can generate from one NIC before the CPU wedges - and in
> most cases every packet generates in interrupt. If you're using
> plain-old-PCI, you get less throughput than more advanced PCI variants.
> There was a thread about this recently. Search the archives for it.

the device is following

 eth0: (PCI Express:2.5GB/s:Width x1)
 eth0: Intel(R) PRO/1000 Network Connection

>This is more in line with hardware / software limitations than with a
>bug in your config. The situation I was describing happened at very low CPS.
>As has transpired on the ML, you can try to boost your performances by:
>- upgrading the kernel to a 2.6.20
>- change your network cards to better models that can handle more than
>one packet per interrupt.

I see.... I would have liked to avoid the problem with kernel
parameter tuning if possible...
But, I'll try the above.

Mikio Kishi

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