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>
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On Feb 21, 2013, at 10:02 AM, Tim Kientzle wrote: > On Feb 21, 2013, at 6:45 AM, Werner Thie wrote: > >> Hi >> >> 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. >> >> The RPi seems to beat the Bbone quite clearly with a ration of 6 : 10 >> >> 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. >> >> Swapping the MFCards does not change the situation at all. >> >> Can anybody out there suppprt this observation and/or explain it? > > I've seen the same behavior with things like SVN checkouts; > the BBone runs quite smoothly for a while and then stalls. > > 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... Warnerhelp
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