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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@davemloft.net>
References: <5cac192f0412230110628749e3@mail.gmail.com> <41CAF444.3000305@trash.net> <5cac192f04122408102129af43@mail.gmail.com> <1104240717.1100.66.camel@jzny.localdomain> <5cac192f0501021530672a908a@mail.gmail.com> <1104764660.1048.578.camel@jzny.localdomain> <52brc68q05.fsf@topspin.com> <5cac192f05010308414a25b548@mail.gmail.com> <527jmu8nbw.fsf@topspin.com> <5cac192f0501030907c755135@mail.gmail.com> <20050103171227.GD7370@esmail.cup.hp.com> <1104812294.1085.53.camel@jzny.localdomain> <20050119144711.3fdd3d93.davem@davemloft.net> <20050119151853.259de49a@dxpl.pdx.osdl.net> <20050119154132.68f0bb4f.davem@davemloft.net>
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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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