Date: Fri, 22 Dec 2006 12:39:04 +1300 From: Mark Kirkwood <markir@paradise.net.nz> To: Bill Moran <wmoran@collaborativefusion.com> Cc: freebsd-stable@freebsd.org, JoaoBR <joao@matik.com.br> Subject: Re: Cached file read performance with 6.2-PRERELEASE Message-ID: <458B1B18.4020400@paradise.net.nz> In-Reply-To: <20061221092510.bb5fd241.wmoran@collaborativefusion.com> References: <45888C68.10305@paradise.net.nz> <200612200816.51043.joao@matik.com.br> <4589128F.9030404@paradise.net.nz> <200612210631.31088.joao@matik.com.br> <458A5C04.9060109@paradise.net.nz> <20061221092510.bb5fd241.wmoran@collaborativefusion.com>
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Bill Moran wrote:
> In response to Mark Kirkwood <markir@paradise.net.nz>:
>> JoaoBR wrote:
>>
>>> I am not convinced that this kind of test is of any value for comparing
>>> systems at all because there are too much factors involved - unless the
>>> competitors are installed on identical hardware. On the other side I think it
>>> is usefull to compare tweaked settings on a particular machine. For example
>>> you may change fsize/bsize of the filesystem or any other and can compare
>>> this results then.
>>>
>> Exactly, that's why I did the comparison - I think you missed the part
>> where I mentioned the 2 systems were *identical* with respect to cpus,
>> memory, mobo - in fact even the power supplies are identical too!
(snippage)
>> In fact, to indulge your skepticism ('cause I think this is a real issue
>> worth sorting out), I booted the FreeBSD system with a Gentoo livecd
>> and ran the same tests there... and guess what - identical results to
>> the installed Gentoo system...so... errm - *my* experimental method is
>> sound...so how about we just get together and see how to make FreeBSD
>> kick Gentoo eh?
>
> I looks like your testing methodology is sound, and that you've
> uncovered an issue worth pursuing.
>
> I recommend starting this thread up on freebsd-performance@. The folks
> on that list are more likely to jump all over this kind of thing.
>
Great - I'm not subscribed to -performance (that is easily fixed
tho...), so I'll set that up and follow your suggestion!
> You might also find helpful people on the current@ and hackers@ lists.
> My gut tells me that any changes that can improve this will be large
> enough that they'll have to go through CURRENT first, then get MFCed
> back in to 6.
Right, no worries there (I can upgrade to CURRENT on my test
machine...should be an interesting exercise in itself!)
> Keep in mind also that the holidays tend to slow things down, it might
> be early January before you get a lot of people looking at this issue
> seriously.
>
Yeah - Merry Xmas to you all!
Cheers
Mark
P.s : JoaoBR, apologies for coming on a bit strong...it was merely my
enthusiasm to get to the bottom (or even the beginning...) of what is
going on here!
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