netdev - Re: [PATCH 03/10] dev.c changes.

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Date:	Fri, 20 Jul 2007 17:55:18 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	davem@...emloft.net, gaagaan@...il.com,
	general@...ts.openfabrics.org, hadi@...erus.ca,
	herbert@...dor.apana.org.au, jagana@...ibm.com, jeff@...zik.org,
	johnpol@....mipt.ru, kumarkr@...ux.ibm.com, mcarlson@...adcom.com,
	mchan@...adcom.com, netdev@...r.kernel.org,
	peter.p.waskiewicz.jr@...el.com, rdreier@...co.com,
	rick.jones2@...com, Robert.Olsson@...a.slu.se, sri@...ibm.com,
	tgraf@...g.ch, xma@...ibm.com
Subject: Re: [PATCH 03/10] dev.c changes.

Patrick McHardy <kaber@...sh.net> wrote on 07/20/2007 04:50:37 PM:

> 32 bytes? I count 16, - 4 for the pointer, so its 12 bytes of waste.
> If you'd use it for gso_skb it would come down to 8 bytes. struct
> net_device is a pig already, and there are better ways to reduce this
> than starting to allocating single members with a few bytes IMO.

Currently, this allocated pointer is an indication to let kernel users
(qdisc_restart, setting/resetting tx_batch_skbs) know whether batching
is enabled or disabled. Removing the pointer and making it static means
those users cannot figure out this information . Adding another field to
netdev may be a bad idea, so I am thinking of overloading dev->features
to add a new flag (other than NETIF_F_BATCH_SKBS, since that is a driver
capabilities flag) which can be set/cleared based on NETIF_F_BATCH_SKBS
bit. Does this approach sound OK ?

Thanks,

- KK

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