On Thu, 6 Jul 2006, Siegfried Nikolaivich wrote:
[ ... reformatted ...]
> Hello,
>
> What kind of x86 CPU does ZFS prefer? In particular, what kind of CPU
> is optimal when using RAID-Z with a large number of disks (8)?
BTW: I've read the existing followups (all good stuff!).
64-bit AMD
> Does L2 cache size play a big role, 256kb vs 512kb vs 1MB? Are there
> any performance improvements when using a dual core or quad processor
> machine?
Solaris code, in general, is designed to take advantage of extra L2
processor cache. As an aside, if you're looking at a 939-pin AMD CPU,
grab one with 1Mb of cache (per core) quickly. The rumor is that large
cache parts will become unavailable in the near future as AMD can squeeze
more small cache CPUs per wafer - and bring them to market to counter the
upcoming price war with Intel. PS: A big cut in AMD prices is rumored to
be less than one month away - but, by then, the 1Mb cache parts may (or
may not ??) be history.
> I am choosing a CPU in a system primarily for ZFS and am wondering
> whether paying the extra price for a larger cache or going dual core
> will provide any benefits. Or would it be better to put the money
> towards a higher clocked CPU?
Solaris "likes" a system with 2 or more processors (or cores). It makes
for a very responsive system.
Recommendation: X2 4400+ for 939-pin single socket system will provide
good long-term value.
PS: Many had really good luck over-clocking the Model 165 Opteron
(939-pin) dual-core part - it is a very easy/conservative overclock.
Unfortunately, it is no longer available from AMD. You might try to EBay
one.
PPS: You may have noticed that the newer AM2 parts are mostly 512kb cache.
Rumor is that parts with 256kb cache (ouch!) will be more easily
available soon.
Email me offlist if you have any further questions.
Regards,
Al Hopper Logical Approach Inc, Plano, TX. [EMAIL PROTECTED]
Voice: 972.379.2133 Fax: 972.379.2134 Timezone: US CDT
OpenSolaris.Org Community Advisory Board (CAB) Member - Apr 2005
OpenSolaris Governing Board (OGB) Member - Feb 2006
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