Re: Scheduler + IPC performance on FreeBSD 7.4, 8.2, 9.0 and -CURRENT

From: Arnaud Lacombe <lacombar_at_gmail.com>
Date: Fri, 6 Apr 2012 14:04:00 -0400
Hi,

On Fri, Apr 6, 2012 at 1:55 PM, Attilio Rao <attilio_at_freebsd.org> wrote:
> Il 06 aprile 2012 18:54, Arnaud Lacombe <lacombar_at_gmail.com> ha scritto:
>> Hi,
>>
>> On Fri, Apr 6, 2012 at 10:58 AM, Attilio Rao <attilio_at_freebsd.org> wrote:
>>> Il 05 aprile 2012 19:03, Arnaud Lacombe <lacombar_at_gmail.com> ha scritto:
>>>> Hi folks,
>>>>
>>>> Over the past months, I ran on a couple of unused box the
>>>> `hackbench'[HACKBENCH] benchmark used by the Linux folks for tracking
>>>> down various kind of regression/improvement. `hackbench' is a
>>>> scheduler + IPC test (socket xor pipe). It creates producers/consumers
>>>> groups and let a variable quantity of small messages flow happily.
>>>> Producers and consumers are either processes xor threads.
>>>>
>>>> Tested platforms were
>>>>  - Atom D510, Intel, (incomplete)
>>>>  - Core 2 Quad Q9560, Intel
>>>>  - Soekris net5501, AMD (incomplete)
>>>>  - Xeon E5645, Intel (incomplete)
>>>>  - Xeon E5620 (dual package), Intel
>>>>  - Xeon E5-1650 (pending completion)
>>>>  - Vortex86, DMP
>>>>
>>>> Tested kernel were:
>>>>  - FreeBSD 7.4-RELEASE
>>>>  - FreeBSD 8.2-RELEASE
>>>>  - FreeBSD 9.0-RC3 and FreeBSD 9.0-RELEASE
>>>>  - FreeBSD 10-CURRENT as of r231573
>>>
>>> Which means you run 10-CURRENT with all the kernel debugging options
>>> on and MALLOC_DEBUG on?
>>>
>> I already answered that question. Namely:
>>
>> <<
>> note: rule [I] is alleviated for -CURRENT kernels, which were built
>> with the same alteration made to GENERIC during the CURRENT->RELEASE
>> transition (ie. WITNESS and a couple of other option disabled).
>>>>
>>
>> this translates into the following patch (for amd64):
>
> Did you enable MALLOC_PRODUCTION and rebuilt libc?
>
Userland originates from FreeBSD 7.4-RELEASE and was not changed for
any of the tests, which are exclusively focused on the kernel. Doing
otherwise would mean changing too many variables.

 - Arnaud
Received on Fri Apr 06 2012 - 16:04:02 UTC

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