Re: freebsd router project. Problems with polling?
From: Gleb Smirnoff (glebius_at_freebsd.org)
Date: 01/29/05
- Previous message: Chris Martin: "Destroying gif interface causes kernel panic"
- In reply to: Thomas Vogt: "freebsd router project. Problems with polling?"
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Date: Sat, 29 Jan 2005 19:29:48 +0300 To: Thomas Vogt <freebsdlists@bsdunix.ch>
Thomas,
can you try if_em driver from HEAD and check whether this help.
There were some work done during 5.3-RELEASE.
On Fri, Jan 28, 2005 at 06:18:19PM +0100, Thomas Vogt wrote:
T> netstat -w 1 (polling disabled)
T> input (Total) output
T> packets errs bytes packets errs bytes colls
T> 300531 0 23441438 300585 0 23444792 0
T> 300939 0 25872898 300895 0 25870184 0
T> 300738 0 23457584 300768 0 23460626 0
T> 300304 10 25826466 300304 0 25826876 0
T> ...
T>
T> Interrupt load is about 70% with net.inet.ip.fastforwarding enabled. If
T> I disable this the system becomes unusable.
T> The system hasn't reach the limit yet. But the interrupt is much to
T> high. It's not worthy to add a second udp sender machine, at the moment.
T>
T>
T> netstat -w 1 (polling enabled)
T> input (Total) output
T> packets errs bytes packets errs bytes colls
T> 150151 47647 12910330 150150 0 12911806 0
T> 150151 0 11711798 150152 0 11711876 0
T> 150151 47665 12910986 150151 0 12911810 0
T> 150151 0 11711798 150151 0 11711798 0
T> ...
T>
T> Interrupt load is about 10%. CPU is about 60% and with
T> kern.polling.idle_poll enabled it goes to 100% (as expected).
T>
T> As you see the speed is droping down to 50% with polling enable and and
T> I got a lot of errors.
T> kern.polling.lost_polls: 188748 and kern.polling.suspect: 186919 are
T> also very high. I don't know why polling is so bad on this machine. All
T> SMP option are disabled in the kernel and bios.
T> I tried to do as much as in
T> http://lists.freebsd.org/pipermail/freebsd-questions/2004-November/064427.html described.
T>
T> I will prepare others tests with -STABLE and -CURRENT in the next few
T> days. At the mean time, are they some other magic things config option I
T> can try? Perhaps increase the HZ to 2000 in the kernel or remove polling
T> and try smp machine? I doubt that I can run the machine without polling.
T> If you see 70% interrupt load with 300k pps without polling.
T>
T> regards
T> Thomas Vogt
T>
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-- Totus tuus, Glebius. GLEBIUS-RIPN GLEB-RIPE _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
- Previous message: Chris Martin: "Destroying gif interface causes kernel panic"
- In reply to: Thomas Vogt: "freebsd router project. Problems with polling?"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
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