On Thu, 19 Jun 2008 09:53:16 pm Arnd Bergmann wrote: > On Thursday 19 June 2008, Mark Nelson wrote: > > The plan is to use Michael Ellerman's code patching work so that at runtime > > if we're running on a Cell machine the new routines are called but otherwise > > the existing memory copy routines are used. > > Have you tried running this code on other platforms to see if it > actually performs worse on any of them? I would guess that the > older code also doesn't work too well on Power 5 and Power 6, so the > cell optimized version could give us a significant advantage as well, > albeit less than another CPU specific version. > > Arnd <>< >
I did run the tests on Power 5 and Power 6, and on Power 5 with the new routines, the iperf bandwidth increased to 7.9 GBits/sec up from 7.5 GBits/sec; but on Power 6 the bandwidth with the old routines was 13.6 GBits/sec compared to 12.8 GBits/sec... I also couldn't get the updated routines to boot on 970MP without removing the dcbz instructions. I'll investigate more and also rerun the tests again Thanks! Mark _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
