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

from [Jeff Garzik] [Permanent Link][Original]
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
In-reply-to: <20050119154132.68f0bb4f.davem@xxxxxxxxxxxxx>
References: <5cac192f0412230110628749e3@xxxxxxxxxxxxxx> <41CAF444.3000305@xxxxxxxxx> <5cac192f04122408102129af43@xxxxxxxxxxxxxx> <1104240717.1100.66.camel@xxxxxxxxxxxxxxxx> <5cac192f0501021530672a908a@xxxxxxxxxxxxxx> <1104764660.1048.578.camel@xxxxxxxxxxxxxxxx> <52brc68q05.fsf@xxxxxxxxxxx> <5cac192f05010308414a25b548@xxxxxxxxxxxxxx> <527jmu8nbw.fsf@xxxxxxxxxxx> <5cac192f0501030907c755135@xxxxxxxxxxxxxx> <20050103171227.GD7370@xxxxxxxxxxxxxxxxx> <1104812294.1085.53.camel@xxxxxxxxxxxxxxxx> <20050119144711.3fdd3d93.davem@xxxxxxxxxxxxx> <20050119151853.259de49a@xxxxxxxxxxxxxxxxx> <20050119154132.68f0bb4f.davem@xxxxxxxxxxxxx>
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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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