Date: Thu, 5 Sep 2013 14:49:19 -0600 From: Warner Losh <imp@bsdimp.com> To: Jia-Shiun Li <jiashiun@gmail.com> Cc: freebsd-arm@freebsd.org Subject: Re: stream benchmarking on RPi Message-ID: <BB5295DB-7E79-4EE9-9056-577A4D270BE2@bsdimp.com> In-Reply-To: <CAHNYxxNtBcjD_Khq1_pYCMdPwZJmQ0M_GTmcaGWtoLOJkz_86g@mail.gmail.com> References: <CAHNYxxNtBcjD_Khq1_pYCMdPwZJmQ0M_GTmcaGWtoLOJkz_86g@mail.gmail.com>
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On Sep 5, 2013, at 2:02 PM, Jia-Shiun Li wrote: > Hi all, > > just did a brief test using stream, the memory bandwidth benchmark, on > RPi with Raspbian and FreeBSD. Share these info to see if someone > might think of it useful. > > FreeBSD is faster at copying. I guess that must be attributed to > recent VM and/or superpage commits. I remembered it to be under > 300MB/s months before. On the other hand, scale, add, and triad are > significantly slower. Anyone have clues or any wild guesses? Soft float? Warner > Below the only compiler option given for cc/gcc is -O3. > > Raspbian 2013-07-26 (lk 3.6, gcc 4.6): > ------------------------------------------------------------- > Function Best Rate MB/s Avg time Min time Max time > Copy: 257.3 0.062703 0.062189 0.063824 > Scale: 205.1 0.079135 0.077993 0.082000 > Add: 284.1 0.085253 0.084480 0.088597 > Triad: 274.3 0.087799 0.087501 0.087940 > ------------------------------------------------------------- > > FreeBSD 10.0-CURRENT r255120 w/ cc(clang): > ------------------------------------------------------------- > Function Best Rate MB/s Avg time Min time Max time > Copy: 365.5 0.045321 0.043779 0.052929 > Scale: 31.2 0.531028 0.513082 0.550906 > Add: 68.5 0.367295 0.350467 0.391310 > Triad: 26.9 0.902672 0.893316 0.908908 > ------------------------------------------------------------- > > FreeBSD 10.0-CURRENT r255120 w/ gcc (4.2.1): > ------------------------------------------------------------- > Function Best Rate MB/s Avg time Min time Max time > Copy: 264.6 0.063977 0.060470 0.081000 > Scale: 31.0 0.535830 0.516093 0.551035 > Add: 46.7 0.534768 0.514323 0.553834 > Triad: 23.1 1.047644 1.038968 1.066887 > ------------------------------------------------------------- > > > Jia-Shiun. > _______________________________________________ > freebsd-arm@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org"
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