Date: Sat, 28 Mar 2015 11:23:56 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: irq cpu binding Message-ID: <CAJ-Vmok=0=C%2BHLvLXEM5pbYp_zP6C498wudAfEA40s4AVpGa_w@mail.gmail.com> In-Reply-To: <20150328181026.GB23643@zxy.spb.ru> References: <20150328112035.GZ23643@zxy.spb.ru> <CAJ-Vmo=sxtLgn1HABbWchu1Hm8kZ4Qy%2BscPeD7ezkkBzr%2BQijA@mail.gmail.com> <20150328154031.GA23643@zxy.spb.ru> <CAJ-VmokpWNy-arZ_=4hNbyAvzBYgDWu4F=vYSDwqPgpjaGHk=w@mail.gmail.com> <20150328181026.GB23643@zxy.spb.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
Ah, I think that's because the taskqueues in the driver for deferred
handling aren't also being pinned.
I've talked to John about this - the problem is that all the
taskqueues for all the drivers run under one kernel process. Find out
their threadids and pin them too.
Eg:
# procstat -ta | grep em0
0 100024 kernel em0 que -1 8 sleep -
0 100025 kernel em0 txq -1 8 sleep -
# vmstat -ia | grep em
irq256: em0 68465 1
# cpuset -g -x 256
irq 256 mask: 0, 1
# cpuset -g -t 100024
tid 100024 mask: 0, 1
# cpuset -g -t 100025
tid 100025 mask: 0, 1
So you'd have to manually do that - there's no generic interface at
the moment to be able to ask a device driver to re-mask its taskqueue
thread(s) for a given queue and rewire its interrupt(s) for that
queue.
(That would be a nice smallish project to prototype, btw.)
-adrian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJ-Vmok=0=C%2BHLvLXEM5pbYp_zP6C498wudAfEA40s4AVpGa_w>