Date: Mon, 26 Jul 2004 16:27:20 -0400 From: Don Bowman <don@sandvine.com> To: 'James' <haesu@towardex.com>, Don Bowman <don@sandvine.com> Cc: freebsd-net@freebsd.org Subject: RE: device polling takes more CPU hits?? Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337051D9444@mail.sandvine.com>
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From: James [mailto:haesu@towardex.com] > > I have two boxes behind em0 that I can use to generate > 250kpps to another vlan > within em0 card as a test, so that bge0 is not involved in > the stress test. > Even when doing so, CPU load climbs higher with device > polling turned on. > Opened up systat, etc to check the interrupts, and em0 is > generating 0 > interrupts with device polling on (as obvious), but general > interrupt load > climbs rock high.. so I don't know what's causing it to > climb. Cleared the > firewall rules as well as a test... no difference :( > > Oh also, just FYI, each vlan interface has link0 set, since > em(4) supports > hardware 802.1q tag/detagging. > The CPU time during the 'polling' is charged to interrupt, even though it occurs during softclock. That's why you see 0 interrupts, but high CPU usage in interrupt. Did u try lowering the 'register' access? --don
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