linux-kernel - Re: [patch v2 0/5] Nano/Microsecond resolution for select() and poll()

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Date:	Sun, 31 Aug 2008 14:28:20 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tglx@...x.de, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch v2   0/5] Nano/Microsecond resolution for select() and
 poll()

On Sun, 31 Aug 2008 14:13:45 -0700 (PDT)
Davide Libenzi <davidel@...ilserver.org> wrote:

> On Sun, 31 Aug 2008, Arjan van de Ven wrote:
> 
> > Note: 
> > even though poll() (as opposed to ppoll()) only accepts milliseconds
> > as userspace interface, the behavior will still improve because the
> > current time no longer needs to be rounded up to the next jiffie,
> > so on average a 500 microseconds behavior improvement.
> 
> Another way to get down in the timeout resolution for newer kernels,
> and still supporting the syscalls with millisec timeouts, is to use
> timerfds.

perhaps, but once you have to change the app you can also make it use
ppoll() rather than poll().. that's a VERY minute change.


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