linux-kernel - Re: [PATCH] drivers/char/hvc_console.c: reduce max idle timeout

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Date:	Tue, 02 Nov 2010 11:35:08 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] drivers/char/hvc_console.c: reduce max idle timeout

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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