From: Jeff Garzik <jgarzik@pobox.com>
To: yshi <yang.shi@windriver.com>
Cc: David Miller <davem@davemloft.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Improvev netconsole support for RTL8139 NIC driver
Date: Tue, 25 Mar 2008 23:14:11 -0400 [thread overview]
Message-ID: <47E9BF83.8070006@pobox.com> (raw)
In-Reply-To: <47E9BA6C.2010502@windriver.com>
yshi wrote:
> David Miller 写道:
>> From: Jeff Garzik <jgarzik@pobox.com>
>> Date: Tue, 25 Mar 2008 22:23:24 -0400
>>
>>
>>> This is bogus -- you should never need to slow down the hot path in
>>> such a way.
>>>
>>
>> Slow down in what way? Even on x86 saving the flags is just
>> about as expensive as a plain sti/cli.
>>
>> I would in fact prefer to see drivers unconditionally use
>> spin_lock_irqsave() et al. in the interrupt handler, for
>> consistency.
>>
> Yes, I agree. Many NIC drivers do the same thing, like Gianfar, E1000, etc.
No, I just looked. Neither gianfar nor e1000 nor e1000e does this.
In fact, gfar_transmit() is precisely an example of what I'm talking
about: you only need to use spin_lock() there.
Jeff
next prev parent reply other threads:[~2008-03-26 3:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-26 2:12 [PATCH] Improvev netconsole support for RTL8139 NIC driver yshi
2008-03-26 2:23 ` Jeff Garzik
2008-03-26 2:38 ` yshi
2008-03-26 2:42 ` David Miller
2008-03-26 2:52 ` yshi
2008-03-26 3:14 ` Jeff Garzik [this message]
2008-03-26 3:14 ` Jeff Garzik
2008-03-26 3:30 ` David Miller
2008-03-26 3:39 ` Jeff Garzik
2008-03-26 3:48 ` Jeff Garzik
2008-03-26 3:53 ` David Miller
2008-03-26 4:32 ` Jeff Garzik
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