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Re: [PATCH] Increase "Safety factor" when ARG_MAX is less than 40KB.

From: Ralf Wildenhues
Subject: Re: [PATCH] Increase "Safety factor" when ARG_MAX is less than 40KB.
Date: Tue, 2 Sep 2008 19:33:32 +0200
User-agent: Mutt/1.5.18 (2008-05-17)

* Peter O'Gorman wrote on Tue, Sep 02, 2008 at 06:58:15PM CEST:
> I was also thinking of something like (pseudocode):
> if ARG_MAX > 80K
>   max_cmd_len=ARG_MAX - 40K
> else
>   max_cmd_len=ARG_MAX / 2
> endif

Sounds not so unreasonable.

> Because you're right, we may be penalizing systems with large ARG_MAX
> unnecessarily. The problem is that you have to make up the constants
> etc, and I was attempting to follow what had been done previously (in
> old libtools max_cmd_len was set to 50% of the calculated value, it was
> changed to 75% along with the patch to use getconf ARG_MAX, iirc).
> Anyway, what formula do you think reasonable?

For starters, how large is the environment and how large is the driver
overhead, in the case where you're hitting the wall?


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