From: John Robinson <john.robinson@anonymous.org.uk>
To: Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: raid6's using not the best bandwidth method && raid6 algo is significantly slower in x86_64.
Date: Sun, 23 Nov 2008 01:12:57 +0000 [thread overview]
Message-ID: <4928AE19.7030601@anonymous.org.uk> (raw)
In-Reply-To: <43d009740811212145x13d2e353l7d9fee3d912c89c0@mail.gmail.com>
On 22/11/2008 05:45, Igor Podlesny wrote:
> 2008/11/22 H. Peter Anvin <hpa@zytor.com>:
> [...]
>>> Please let us know when commiting the patch -- 20 % is valuable.
>>> ;-)
>>>
>> Looks like I was a bit too optimistic. The 20% was because of the missed
>> prefetchnta, which means polluting the cache.
>
> Well, whatever it gives unless it's a regression. :-)
Not sure I agree with that - if the 20% improvement were to have a heavy
impact on the rest of system performance when the system is already
going to be underperforming, it may not worth having (though it might be
an option for people who can afford the CPU or whatever).
Cheers,
John.
next prev parent reply other threads:[~2008-11-23 1:12 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-17 22:35 raid6's using not the best bandwidth method && raid6 algo is significantly slower in x86_64 H. Peter Anvin
2008-11-18 12:03 ` Igor Podlesny
2008-11-18 15:47 ` H. Peter Anvin
2008-11-21 19:22 ` Igor Podlesny
2008-11-21 19:31 ` H. Peter Anvin
2008-11-21 19:33 ` Igor Podlesny
2008-11-21 20:15 ` H. Peter Anvin
2008-11-22 5:40 ` Igor Podlesny
2008-11-22 5:42 ` H. Peter Anvin
2008-11-22 5:45 ` Igor Podlesny
2008-11-23 1:12 ` John Robinson [this message]
2008-12-05 13:36 ` Igor Podlesny
2008-12-05 17:34 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2008-11-16 16:18 Igor Podlesny
2008-11-17 0:36 ` H. Peter Anvin
2008-11-17 20:56 ` Igor Podlesny
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