Date: Wed, 18 Jul 2007 14:54:10 -0500 (CDT) From: Scott Bennett <bennett@cs.niu.edu> To: rwatson@FreeBSD.org Cc: freebsd-net@freebsd.org, freebsd-current@freebsd.org, max@love2party.net Subject: Re: Reminder: NET_NEEDS_GIANT, debug.mpsafenet going away in Message-ID: <200707181954.l6IJsAvN013572@mp.cs.niu.edu>
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On Wed, 18 Jul 2007 20:48:21 +0100 (BST) Robert Watson
<rwatson@FreeBSD.org> wrote:
>On Wed, 18 Jul 2007, Scott Bennett wrote:
>
>> [Cc: list trimmed a bit more --SB]
>> On Tue, 17 Jul 2007 23:42:14 +0200 Max Laier <max@love2party.net>
>>
>>> [ Excess CC-list ... testers needed!!! ]
>>>
>>> On Tuesday 17 July 2007, Robert Watson wrote:
>>
>> I missed Robert Watson's start of thread, so I'm jumping in here
>> with a question.
>>
>>>> This is a reminder e-mail that, in the very near future, Giant
>>>> compatibility shims for network protocols will be removed.
>>
>> How, if at all, will this affect qemu users? qemu exits unless AIO is
>> present in the kernel (or aio.ko has been kldload-ed). In FreeBSD 6.2, AIO
>> results in a warning message at boot time that says AIO is not MPSAFE and
>> that therefore the networking stack will take a deep performance hit.
>
>Per several earlier e-mails in the thread, AIO is MPSAFE in FreeBSD 7.0 and,
>as such, unaffected by this change. As a result, I would expect that
>applications depending on AIO should now perform significantly better (but
>have done no measurement in this area).
>
Great! Thanks for this news. My apologies for missing the previous
messages.
Scott Bennett, Comm. ASMELG, CFIAG
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