Date: Thu, 21 Feb 2013 10:52:16 -0700 From: Warner Losh <imp@bsdimp.com> To: Tim Kientzle <tim@kientzle.com> Cc: freebsd-arm@freebsd.org Subject: Re: MFCard access speed difference between RPi and Beaglebone Message-ID: <071CB345-EA30-4799-B59C-AFA6C1C03F83@bsdimp.com> In-Reply-To: <337A8E96-9B28-4F98-8131-9E68A57B42E3@kientzle.com> References: <51263322.3030706@thieprojects.ch> <337A8E96-9B28-4F98-8131-9E68A57B42E3@kientzle.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Feb 21, 2013, at 10:02 AM, Tim Kientzle wrote: > On Feb 21, 2013, at 6:45 AM, Werner Thie wrote: >=20 >> Hi >>=20 >> trying to nail down the crash and core dump in Python when importing = ctypes I did a parallel build of python on both systems with the same = SVN rev 246947 of kernel. >>=20 >> The RPi seems to beat the Bbone quite clearly with a ration of 6 : 10 >>=20 >> It is very apparent (when unpacking for instance) that the Bb shows a = much more pronounced 'hickup' behavior, unpacking 40-60 files and then = most probably doing disk IO. >>=20 >> Swapping the MFCards does not change the situation at all. >>=20 >> Can anybody out there suppprt this observation and/or explain it? >=20 > I've seen the same behavior with things like SVN checkouts; > the BBone runs quite smoothly for a while and then stalls. >=20 > I've been assuming that it was the MMCSD driver; skimming > through the code, it looks like there's a lot of room for > improvement. I write mmcsd(4) for crappy hardware (the AT91RM9200's mmc controller = was a new low in low performance), so I never got a chance to do much = optimization. I'm sure there's much low-hanging fruit there... Warner
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?071CB345-EA30-4799-B59C-AFA6C1C03F83>