netdev - Re: [PATCH] PATCH 1/2 [SCHED 2.6.24]: Check subqueue status before calling hard_start

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Message-ID: <OFBECB3B91.68D55578-ON65257393.002AB87D-65257393.002AC686@in.ibm.com>
Date:	Wed, 14 Nov 2007 13:17:13 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, peter.p.waskiewicz.jr@...el.com
Subject: Re: [PATCH] PATCH 1/2 [SCHED 2.6.24]: Check subqueue status before calling
 hard_start_xmit

Hi Dave,

David Miller <davem@...emloft.net> wrote on 11/14/2007 11:44:39 AM:

> > You could optimize this by getting HARD_TX_LOCK after the check. I
> > assume that netif_stop_subqueue (from another CPU) would always be
> > called by the driver xmit, and that is not possible since we hold
> > the __LINK_STATE_QDISC_RUNNING bit. Does that sound correct?
>
> I don't think this is a critical optimization at this time,
> but something to certainly do along with the surgery
> we'll undoubtedly be doing here in the future :-)

Agree. Will keep in mind for later :)

Thanks,

- KK

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