RE: device polling takes more CPU hits??
From: Don Bowman (don_at_sandvine.com)
Date: 07/26/04
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To: 'James' <haesu@towardex.com>, Don Bowman <don@sandvine.com> Date: Mon, 26 Jul 2004 16:27:20 -0400
From: James [mailto:haesu@towardex.com]
>
> I have two boxes behind em0 that I can use to generate
> 250kpps to another vlan
> within em0 card as a test, so that bge0 is not involved in
> the stress test.
> Even when doing so, CPU load climbs higher with device
> polling turned on.
> Opened up systat, etc to check the interrupts, and em0 is
> generating 0
> interrupts with device polling on (as obvious), but general
> interrupt load
> climbs rock high.. so I don't know what's causing it to
> climb. Cleared the
> firewall rules as well as a test... no difference :(
>
> Oh also, just FYI, each vlan interface has link0 set, since
> em(4) supports
> hardware 802.1q tag/detagging.
>
The CPU time during the 'polling' is charged to interrupt,
even though it occurs during softclock. That's why you
see 0 interrupts, but high CPU usage in interrupt.
Did u try lowering the 'register' access?
--don
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- Previous message: Luigi Rizzo: "Re: device polling takes more CPU hits??"
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