Date: Sun, 27 Dec 2015 23:02:47 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Mark Millard <markmi@dsl-only.net>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: fyi: 11.0-current rpi2 systat -vmstat shows around 24k interrupts for bcm283x_dw Message-ID: <56806007.2000302@selasky.org> In-Reply-To: <0A781C7D-C5F5-4931-AE38-D2FEC0848DCA@dsl-only.net> References: <0A781C7D-C5F5-4931-AE38-D2FEC0848DCA@dsl-only.net>
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On 12/26/15 21:51, Mark Millard wrote: > Context: > >> # freebsd-version -ku; uname -aKU >> 11.0-CURRENT >> 11.0-CURRENT >> FreeBSD rpi2 11.0-CURRENT FreeBSD 11.0-CURRENT #2 r292413M: Fri Dec 25 18:03:19 PST 2015 root@FreeBSDx64:/usr/obj/clang/arm.armv6/usr/src/sys/RPI2-NODBG arm 1100091 1100091 > > > For a basically near-idle context systat -vmstat lists "Int" and 23k to 25k normally (almost always 24k) and bcm283x_dw at the right shows figures like 24118. "generic_ti" is more like 232 and "ipi 76" is more like 111. The others at the right are normally blank (other than total). > > Lots of bcm283x_dw interrupts if around 24k is correct. As the numbers do not change scale when the systat refresh interval is explicitly scaled, I assume that the figures are per second (or per some other time unit, possibly just for the most recent unit instead of mean). > > I'm not sure it will be readable but the below is a capture of a systat -vmstat display. > Hi, The dwc_otg needs to be served frequently in PIO mode. Your number is expected. We're using fast interrupts for most of this work, so no task-switching is involved and so the CPU consumption remains low. You can disable USB like this: usbconfig -d 0.1 set_config 255 And the interrupts should go down to zero. Re-enable like this: usbconfig -d 0.1 set_config 0 --HPS
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