Date: Mon, 26 Jul 2004 13:02:58 -0400 From: James <haesu@towardex.com> To: Don Bowman <don@sandvine.com> Cc: freebsd-net@freebsd.org Subject: Re: device polling takes more CPU hits?? Message-ID: <20040726170257.GA75739@scylla.towardex.com> In-Reply-To: <FE045D4D9F7AED4CBFF1B3B813C85337051D9435@mail.sandvine.com> References: <FE045D4D9F7AED4CBFF1B3B813C85337051D9435@mail.sandvine.com>
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Hi Don,
> That's a pretty high HZ, here's what i have:
> kern.clockrate: { hz = 2500, tick = 400, tickadj = 1, profhz = 1024, stathz
> = 128 }
Hmm... I'll try setting it to 2500 later this week during maint. window for
customers behind that box. It's weird b/c I have another box with devpolling
that has 4000 as its HZ and has no problems.
Thanks,
-J
> I have the same box spec as you, only with em (bge doesn't
> support polling, but it has its own interrupt coalescer that works...
> you can tune that in the if_bge.h I think, there's some comments).
> I'm doing ~800Kpps with polling. My polling params are below.
> > root@r2.bos# sysctl kern.polling
> > kern.polling.burst: 150
> > kern.polling.each_burst: 5
> > kern.polling.burst_max: 150
> > kern.polling.idle_poll: 1
> > kern.polling.poll_in_trap: 1
> > kern.polling.user_frac: 50
> > kern.polling.reg_frac: 20
> > kern.polling.short_ticks: 4909
> > kern.polling.lost_polls: 11464
> > kern.polling.pending_polls: 0
> > kern.polling.residual_burst: 0
> > kern.polling.handlers: 1
> > kern.polling.enable: 1
> > kern.polling.phase: 0
> > kern.polling.suspect: 10249
> > kern.polling.stalled: 3
> >
> > root@r2.bos# sysctl machdep.cpu_idle_hlt
> > machdep.cpu_idle_hlt: 1
> >
>
> kern.polling.burst: 1000
> kern.polling.each_burst: 80
> kern.polling.burst_max: 1000
> kern.polling.idle_poll: 1
> kern.polling.poll_in_trap: 0
> kern.polling.user_frac: 5
> kern.polling.reg_frac: 120
> kern.polling.short_ticks: 29
> kern.polling.lost_polls: 55004
> kern.polling.pending_polls: 0
> kern.polling.residual_burst: 0
> kern.polling.handlers: 4
> kern.polling.enable: 1
> kern.polling.phase: 0
> kern.polling.suspect: 50690
> kern.polling.stalled: 25
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--
James Jun TowardEX Technologies, Inc.
Technical Lead Network Design, Consulting, IT Outsourcing
james@towardex.com Boston-based Colocation & Bandwidth Services
cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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