Interesting... Perhaps you could send me your "bad" kernel vmlinux or raid456.ko file; preferrably compiled with CONFIG_DEBUG_INFO. -- Sent from my mobile phone (pardon any lack of formatting) -----Original Message----- From: Igor Podlesny <for.poige+linux@xxxxxxxxx> Sent: Monday, November 17, 2008 12:56 To: H. Peter Anvin <hpa@xxxxxxxxx> Cc: linux-raid@xxxxxxxxxxxxxxx; neilb@xxxxxxx Subject: Re: raid6's using not the best bandwidth method && raid6 algo is significantly slower in x86_64. 2008/11/17 H. Peter Anvin <hpa@xxxxxxxxx>: > Igor Podlesny wrote: >> [...] >> Has anyone on the list similar observations? Can gcc's version >> difference affect so much? I doubt that, but I can try build x86_32 >> with gcc 4.3.1 (as x86_64 was). >> > > The SSE modes have nicer cache behaviours and are therefore preferred > even if they are slower. > That was my guess that they're preferable (but I wasn't aware of exact reason, thanks!). :-) > > It is very odd that your SSE2 modes are that much slower in 64-bit mode. > It could just be an artifact of the may the test is done (cache > anomalies?), but I kind of suspect there is something more fishy going on-- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
