From owner-freebsd-mips@FreeBSD.ORG  Tue Oct  4 15:48:46 2011
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Date: Tue, 4 Oct 2011 23:48:45 +0800
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From: Adrian Chadd <adrian@freebsd.org>
To: "Jayachandran C." <jchandra@freebsd.org>
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Cc: Kostik Belousov <kostikbel@gmail.com>, Alexander Motin <mav@freebsd.org>,
	freebsd-mips@freebsd.org
Subject: Re: svn commit: r225892 - head/sys/mips/mips
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Hi all,

I've tried jc's patch. The hand-wavy, brief summary when tested on my
hostap (mips):

* when doing single-stream, one way TCP tests (where it thus needs
TX/RX traffic to occur), I get 100% CPU utilisation - 50% interrupt,
50% system, but the total interrupt rate isn't too high. It's much
higher than without his patch. I'll go digging later to see what's
going on.
* when doing single-stream, one way UDP (ie, only RX traffic, no TX
besides beacons and occasional other stuff), the system utilisation is
better (70% system, ~ 2% interrupt). But I still see interrupt latency
issues. I don't know whether it's because interrupts are missed or
they're not missed but the scheduling doesn't occur until after wait
has returned. I'll have to do some further digging.



adrian