Hello, Petr Vandrovec wrote: > I have recompiled kernel with all debugging disabled, and it brought me > 1.5MBps, so it is still consistently 1MBps slower than on sil. Disabling > NCQ seems to improve concurrent access a bit (for which I have no > explanation), while slows down single drive scenario: > > With NCQ: > > 1TB alone: 81.22, 79.86 > 1TB+1TB: 56.28+56.70, 53.51+56.11 > > Without NCQ: > > 1TB alone: 79.78, 80.82 > 1TB+1TB: 57.99+58.12, 56.50+56.46 > > 3512 sil, no NCQ: > > 1TB alone: 82.28, 82.18 > 1TB+1TB: 47.20+47.54 # Here apparently command based switching or > 1.5Gbps link between device and PMP becomes bottleneck Hmmmm.... Weird. Is the different still there if you take PMP out of the picture? > And it seems that I observe what other poster pointed out - that > apparently all SiI chips are limited somewhere around 120-130MBps, and > cannot do more even if you pretty ask... Yeah, that seems to be the hardware limit and is consistent with what I hear from non-linux people too. -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
