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Re: [openib-general] Re: LLTX and netif_stop_queue

To: "David S. Miller" <davem@xxxxxxxxxxxxx>
Subject: Re: [openib-general] Re: LLTX and netif_stop_queue
From: Jeff Garzik <jgarzik@xxxxxxxxx>
Date: Wed, 19 Jan 2005 19:02:52 -0500
Cc: Stephen Hemminger <shemminger@xxxxxxxx>, hadi@xxxxxxxxxx, iod00d@xxxxxx, eric.lemoine@xxxxxxxxx, roland@xxxxxxxxxxx, netdev@xxxxxxxxxxx, ak@xxxxxxx, openib-general@xxxxxxxxxx, kaber@xxxxxxxxx
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References: <> <> <> <1104240717.1100.66.camel@jzny.localdomain> <> <1104764660.1048.578.camel@jzny.localdomain> <> <> <> <> <> <1104812294.1085.53.camel@jzny.localdomain> <> <> <>
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David S. Miller wrote:
Usually we strive for BH disabling locks in order to decrease the
amount of hard IRQ disabling time in the kernel.  But here, as soon
as we call into ->hard_start_xmit(), the driver typically turns hard
IRQs off anyways.
Also, changing dev->xmit_lock to be IRQ disabling is not %100 trivial.

Agreed on both counts...

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