netdev - Re: [PATCH v3 01/10] dql: Dynamic queue limits

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Message-ID: <1322060750.17693.42.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Wed, 23 Nov 2011 16:05:50 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH v3 01/10] dql: Dynamic queue limits

Le mercredi 23 novembre 2011 à 15:58 +0100, Eric Dumazet a écrit :

> Another question is : Is DQL planned to work on 32bit arch ?
> 
> A fast interface can probably send more than 2^32 bytes for large
> slack_hold_time values, and wrap around.
> 
> If yes : We can use "unsigned int" instead of "unsigned long" to lower
> memory need on 64bit arch.
> 
> If no, "unsigned long" type is not enough on 32bit, or we need to limit
> slack_hold_time to small intervals...
> 
> 

Hmm, reading again the code, 32bit counters should be more than enough,
instead of "unsigned long", on all arches.

unsigned long is only needed for slack_start_time  (to store jiffies)

This would lower sizeof( struct dql) to 48 or 56 bytes.


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