netdev - Re: [PATCH 0/10 REV5] Implement skb batching and support in IPoIB/E1000

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Message-ID: <OF4096F552.5B89C6BA-ON65257359.0016534B-65257359.0016C2D0@in.ibm.com>
Date:	Mon, 17 Sep 2007 09:38:36 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	gaagaan@...il.com, general@...ts.openfabrics.org, hadi@...erus.ca,
	herbert@...dor.apana.org.au, jagana@...ibm.com, jeff@...zik.org,
	johnpol@....mipt.ru, kaber@...sh.net, kumarkr@...ux.ibm.com,
	mcarlson@...adcom.com, mchan@...adcom.com, netdev@...r.kernel.org,
	peter.p.waskiewicz.jr@...el.com, randy.dunlap@...cle.com,
	rdreier@...co.com, rick.jones2@...com, Robert.Olsson@...a.slu.se,
	shemminger@...ux-foundation.org, sri@...ibm.com, tgraf@...g.ch,
	xma@...ibm.com
Subject: Re: [PATCH 0/10 REV5] Implement skb batching and support in IPoIB/E1000

Hi Dave,

David Miller <davem@...emloft.net> wrote on 09/17/2007 04:47:48 AM:

> The only major complaint I have about this patch series is that
> the IPoIB part should just be one big changeset.  Otherwise the
> tree is not bisectable, for example the initial ipoib header file
> change breaks the build.

Right, I will change it accordingly.

> On a lower priority, I question the indirection of skb_blist by making
> it a pointer.  For what?  Saving 12 bytes on 64-bit?  That kmalloc()'d
> thing is a nearly guarenteed cache and/or TLB miss.  Just inline the
> thing, we generally don't do crap like this anywhere else.

The intention was to avoid having two flags (one that driver supports
batching and second to indicate that batching is on/off). So I could test
skb_blist as an indication of whether batching is on/off. But your point
on cache miss is absolutely correct, and I will change this part to be
inline.

thanks,

- KK

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