From: Adam Talbot <talbotx@comcast.net>
To: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: Does software RAID take advantage of SMP, or 64 bit CPU(s)?
Date: Tue, 23 May 2006 07:44:59 -0700 [thread overview]
Message-ID: <44731FEB.6020602@comcast.net> (raw)
In-Reply-To: <17522.43808.68998.902497@cse.unsw.edu.au>
-Neil
I was not looking for any direct advantage. It is more a money VS
performance thing. I have a old dual proc Opteron motherboard. I am
going with 64-bit, but it is much cheaper if I just go buy a nice single
proc board instead of buying two Opterons for my dual proc board. If I
could get a 1.5~2X performance improvement with SMP I would pay the
extra money. If there is no major performance difference, I will take
the cheap road.
Thank you for the good input.
-Adam
P.S. Here is my current plan.
RAID 6, 6X 400GB SATA 2.0 HDD's, Athlon FX 53, 1GB DDR 400, Nvidia based
motherboard, Gb Ethernet. Storing 15,000+ MP3's, 500+ movies.
Neil Brown wrote:
> On Monday May 22, talbotx@comcast.net wrote:
>
>> A few simple questions about the 2.6.16+ kernel and software RAID.
>> Does software RAID in the 2.6.16 kernel take advantage of SMP?
>>
>
> Not exactly. RAID5/6 tends to use just one cpu for parity
> calculations, but that frees up other cpus for doing other important
> work.
>
>
>> Does software RAID take advantage of 64-bit CPU(s)?
>>
>
> No more or less that other code in the kernel. Sometimes using a 64-bit
> CPU is a cost because more data is shuffled around...
>
> Was there some particular sort of 'advantage' that you were thinking
> of?
>
> NeilBrown
>
>
>
>> If there are any good web sites that cover this information, a link
>> would be GREAT!
>>
>> -Adam Talbot
>>
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>> the body of a message to majordomo@vger.kernel.org
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>>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
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>
next prev parent reply other threads:[~2006-05-23 14:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-23 6:21 Does software RAID take advantage of SMP, or 64 bit CPU(s)? Adam Talbot
2006-05-23 6:26 ` Neil Brown
2006-05-23 14:44 ` Adam Talbot [this message]
2006-05-26 0:14 ` Nix
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