Date: Fri, 23 Sep 2011 23:29:02 +0800 From: Adrian Chadd <adrian@freebsd.org> To: Alexander Motin <mav@freebsd.org> Cc: freebsd-current@freebsd.org Subject: ath / 802.11n performance issues and timer code Message-ID: <CAJ-VmomZyDJV62yCQOvG=UB6H4wfz9=3_cWzEL7vWAA14TCyYA@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
Hi Alexander, I've been looking at issues with 802.11n RX performance on these MIPS24k based MIPS boards. After doing a bit of digging, I discovered what looked like strange scheduler issues where the RX and TX completion schedulers weren't being invoked quickly. The ath driver schedules these functions using taskqueues. Here's the time keeper configuration for my mips24k board: # sysctl kern.eventtimer kern.eventtimer.choice: MIPS32(800) kern.eventtimer.et.MIPS32.flags: 7 kern.eventtimer.et.MIPS32.frequency: 360000000 kern.eventtimer.et.MIPS32.quality: 800 kern.eventtimer.periodic: 1 kern.eventtimer.timer: MIPS32 kern.eventtimer.idletick: 0 kern.eventtimer.singlemul: 2 When I set kern.eventtimer.periodic=1, the 11n TX/RX performance suddenly jumps to where it should be. Would you mind helping me figure out what the problem is? I didn't think kern.eventtimer.periodic was needed? Thanks, Adrian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJ-VmomZyDJV62yCQOvG=UB6H4wfz9=3_cWzEL7vWAA14TCyYA>