Re: raid6's using not the best bandwidth method && raid6 algo is significantly slower in x86_64.

["H. Peter Anvin" <hpa@zytor.com>]

Igor Podlesny wrote:
> 2008/11/18 H. Peter Anvin <hpa@zytor.com>:
>> Igor Podlesny wrote:
>>> 2008/11/18 H. Peter Anvin <hpa@zytor.com>:
>>>> Interesting... Perhaps you could send me your "bad" kernel vmlinux or
>>>> raid456.ko file;
> 
> 	I've narrowed it a bit: the problem arises only when "-Os" is being used.
>> Built-in is fine.  I need the vmlinux file, though, not bzImage.
>>
> 	Ok, it's compiling right now. vmlinux is pretty huge, so I guess it'd
> be better to upload it to an ftp.
> 

It probably is.  My side can handle large emails, but yours might not
(and, obviously, don't send it to the list.)

It sort of makes sense that -Os would break this stuff.  For newer gccs,
it would be better to use SSE2 intrinsics rather than inline assembly.
The problem is that it breaks older gcc.

	-hpa