Date: Thu, 08 Oct 2009 20:42:36 +0500 From: rihad <rihad@mail.ru> To: Ian Smith <smithi@nimnet.asn.au> Cc: freebsd-net@freebsd.org, Eugene Grosbein <eugen@kuzbass.ru>, Robert Watson <rwatson@freebsd.org>, Luigi Rizzo <rizzo@iet.unipi.it>, Julian Elischer <julian@elischer.org> Subject: Re: dummynet dropping too many packets Message-ID: <4ACE086C.2020308@mail.ru> In-Reply-To: <20091008212623.D88524@sola.nimnet.asn.au> References: <4AC9E29B.6080908@mail.ru> <20091005123230.GA64167@onelab2.iet.unipi.it> <4AC9EFDF.4080302@mail.ru> <4ACA2CC6.70201@elischer.org> <4ACAFF2A.1000206@mail.ru> <4ACB0C22.4000008@mail.ru> <20091006100726.GA26426@svzserv.kemerovo.su> <4ACB42D2.2070909@mail.ru> <20091006142152.GA42350@svzserv.kemerovo.su> <4ACB6223.1000709@mail.ru> <20091006161240.GA49940@svzserv.kemerovo.su> <alpine.BSF.2.00.0910061804340.50283@fledge.watson.org> <4ACC5563.602@mail.ru> <4ACC56A6.1030808@mail.ru> <alpine.BSF.2.00.0910070957430.58146@fledge.watson.org> <4ACC5DEC.1010006@mail.ru> <alpine.BSF.2.00.0910071036280.58146@fledge.watson.org> <4ACC65A0.7030900@mail.ru> <alpine.BSF.2.00.0910071312420.58146@fledge.watson.org> <4ACC8CC8.8050403@mail.ru> <alpine.BSF.2.00.0910071420290.38033@fledge.watson.org> <4ACCA92A.9070803@mail.ru> <20091008212623.D88524@sola.nimnet.asn.au>
next in thread | previous in thread | raw e-mail | index | archive | help
Ian Smith wrote:
> On Wed, 7 Oct 2009, rihad wrote:
>
> > Robert Watson wrote:
> >
> > > I would suggest making just the HZ -> 4000 change for now and see how it
> > > goes.
> > >
> > OK, I will try testing HZ=4000 tomorrow morning, although I'm pretty sure
> > there still will be some drops.
>
> Even if there are, I'd like to know what (rough) percentage in increased
> interrupt load you experience with HZ=4000 vs 1000 on that beast in your
> application, or of any discernable effects on other running processes?
>
Besides having little (if any) positive effect on the output packet drop
rate, it runs pretty well, there's no apparent difference, no drop in
performance etc.
Current interrupt load snapshot as per systat -vmstat:
Interrupts
59606 total
atkbd0 1
ata0 irq14
931 mfi0 irq16
uhci0 uhci
4001 cpu0: time
23549 bce0 256
3118 bce1 257
3999 cpu3: time
3999 cpu2: time
4001 cpu1: time
4003 cpu4: time
4003 cpu5: time
4001 cpu6: time
4001 cpu7: time
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4ACE086C.2020308>