From: Michael Ellerman <michael@ellerman.id.au>
To: Chris Metcalf <cmetcalf@tilera.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drivers/char/hvc_console.c: reduce max idle timeout
Date: Tue, 02 Nov 2010 11:35:08 +1100 [thread overview]
Message-ID: <1288658108.16790.13.camel@concordia> (raw)
In-Reply-To: <201010271659.o9RGxrMc009847@farm-0002.internal.tilera.com>
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On Wed, 2010-10-27 at 12:54 -0400, Chris Metcalf wrote:
> The tile architecture uses this framework for our serial console,
> and our users complain that the delay of up to two seconds feels like
> the machine has gone non-responsive and is disturbing. By contrast,
> a delay of up to half a second feels like just the normal sort of
> delay caused by swapping, network lag, etc. and is not noticeable.
> The overhead is obviously not much greater.
It's 4 times greater.
We picked 2 seconds because it gave a reasonable trade off between
responsiveness and load. I'm not convinced that half a second is a
better number.
cheers
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next prev parent reply other threads:[~2010-11-02 0:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-27 16:54 [PATCH] drivers/char/hvc_console.c: reduce max idle timeout Chris Metcalf
2010-10-27 19:21 ` Alan Cox
2010-10-27 19:46 ` Chris Metcalf
2010-11-02 0:35 ` Michael Ellerman [this message]
2010-11-02 2:21 ` Chris Metcalf
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