Date: Fri, 14 Nov 2008 12:49:13 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hardware@freebsd.org Cc: freebsd-net@freebsd.org Subject: Re: IRQ31 and IRQ32 on HPDL585 running FreeBSD 7.0 are consuming HIGH CPU usage Message-ID: <gfjoio$cf3$1@ger.gmane.org> In-Reply-To: <305614.76266.qm@web45809.mail.sp1.yahoo.com> References: <305614.76266.qm@web45809.mail.sp1.yahoo.com>
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[-- Attachment #1 --] Won De Erick wrote: > Another thing, I observed that in the above test, the net.isr is enabled by default. When I tried disabling this, > > # sysctl net.isr.direct=0 > net.isr.direct: 1 -> 0 > > the result: > > 52 root 1 -68 - 0K 16K WAIT b 64:00 42.97% irq32: bce1 > 51 root 1 -68 - 0K 16K WAIT a 38:22 12.26% irq31: bce0 > > The CPU utilizations considerably dropped! You will probably find a "swi" process that has picked up the difference (when isr.direct is disabled, some of network protocol processing is offloaded to a swi thread). This might help spread the load across CPU but in my testing it didn't help real-world throughput. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJHWW5ldnAQVacBcgRAuSIAKCTKl2OQhfLfdZEko958W+sLSOk8QCfTGwe NuARD4/ZI0qppdyEmyfMtYU= =1918 -----END PGP SIGNATURE-----
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