Date: Thu, 15 Dec 2011 19:59:01 +0200 From: Daniel Kalchev <daniel@digsys.bg> To: Attilio Rao <attilio@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: SCHED_ULE should not be the default Message-ID: <C24D582B-E196-4D8F-8EB8-6E3A39974547@digsys.bg> In-Reply-To: <CAJ-FndBmQ6LefogN46eha9mz9ui3xXqEB=QV-=92a=S5kv_PBA@mail.gmail.com> References: <4EE1EAFE.3070408@m5p.com> <4EE22421.9060707@gmail.com> <4EE6060D.5060201@mail.zedat.fu-berlin.de> <20111213073615.GA69641@icarus.home.lan> <4EE7093E.4050006@digsys.bg> <CAJ-FndBmQ6LefogN46eha9mz9ui3xXqEB=QV-=92a=S5kv_PBA@mail.gmail.com>
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On Dec 15, 2011, at 6:26 PM, Attilio Rao wrote:
> 2011/12/13 Daniel Kalchev <daniel@digsys.bg>:
>>
>>
>> On 13.12.11 09:36, Jeremy Chadwick wrote:
>>>
>>> I personally would find it interesting if someone with a higher-end system
>>> (e.g. 2 physical CPUs, with 6 or 8 cores per CPU) was to do the same test
>>> (changing -jX to -j{numofcores} of course).
>>
>>
>> Is 4 way 8 core Opteron ok? That is 32 cores, 64GB RAM.
>>
>> Testing with buildworld in my opinion is not adequate, as it involves way
>> too much I/O. Any advice on proper testing methodology?
>
> I'm sure that I/O and pmap subsystem contention (because of
> buildworld) and TLB shootdown overhead (because of 32 CPUs) will be so
> overwhelming that you are not really going to benchmark the scheduler
> activity at all.
Can't pmap / TLB be tuned for 32 CPUs and 64GB of RAM?
>
> However I still don't get what you want to verify exactly?
The obvious: is SCHED_ULE better or worse than SCHED_4BSD on such platform.
Problem is how to test "interactivity" -- that is a blade server and doesn't really have a display and keyboard, nor does it have X etc.
I have spare pair of those, that might be put to crunch tests to see how things compare for different scenarios - but I need ideas what to test, really.
Daniel
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