Hi Derick, Thu, 12 Sep 2013 11:18:35 +0200 Derick Swanepoel <dswanepoel@xxxxxxxxx> ==> Lars Täuber <taeuber@xxxxxxx> : > Hi Lars, > > Sorry, I neglected to mention my ggaoed config. I used direct IO for all tests (except the ramdisk which can't be opened with O_DIRECT). queue-length was 128, ring-buffer-size was 4096. > > Increasing queue-length from 16 through to 128 increased performance to the speeds I reported previously (it was about 200 MB/s at the default queue-length of 16). Anything bigger than 128 had no effect. > > Increasing the ring buffer size beyond the default 4096 kB had no discernible effect. > > Disabling direct IO or enabling merge-delay decreased performance for all tests. thanks for this info. I wonder what the machine is doing when the ggaoed doesn't use any cpu cycle. I suspect that there must be something forcing waits. [...] > >> > >> Test MB/s CPU AvgPktSz Direct MB/s CPU AvgPktSz > >> Disk Read 538 95% 2083 623 67% 4333 > >> Disk Write 443 97% 2095 582 75% 4345 > >> Ramdisk Read 655 97% 2083 778 69% 4333 > >> Ramdisk Write 424 100% 2095 624 81% 4345 > >> [...] > >> I also tried other Linux targets: > >> > >> ggaoed: About 25% slower than vblade: > >> > >> Test MB/s CPU Direct MB/s CPU > >> Disk Read 446 71% 446 51% > >> Disk Write 355 63% 557 56% > >> Ramdisk Read 531 91% 627 67% > >> Ramdisk Write 399 85% 602 73% ggaoed uses the fewest cpu cycles from all targets. It seems to use about 25% less cycles to be 25% slower. It's a pity that Gábor gave up further developement on ggaoed. Regards Lars ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. Consolidate legacy IT systems to a single system of record for IT 2. Standardize and globalize service processes across IT 3. Implement zero-touch automation to replace manual, redundant tasks http://pubads.g.doubleclick.net/gampad/clk?id=51271111&iu=/4140/ostg.clktrk _______________________________________________ Aoetools-discuss mailing list Aoetools-discuss@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
