From: "Jesse Huang" <jesse@icplus.com.tw>
To: "Jeff Garzik" <jgarzik@pobox.com>
Cc: <linux-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
<akpm@osdl.org>
Subject: Re: [PATCH 2/6] IP100A Fix Tx pause bug
Date: Tue, 22 Aug 2006 09:17:08 +0800 [thread overview]
Message-ID: <00bd01c6c588$afdedbc0$4964a8c0@icplus.com.tw> (raw)
In-Reply-To: 44E5A425.8020200@pobox.com
----- Original Message -----
From: "Jeff Garzik" <jgarzik@pobox.com>
To: "Jesse Huang" <jesse@icplus.com.tw>
Cc: <linux-kernel@vger.kernel.org>; <netdev@vger.kernel.org>;
<akpm@osdl.org>
Sent: Friday, August 18, 2006 7:27 PM
Subject: Re: [PATCH 2/6] IP100A Fix Tx pause bug
(1)
>> + iowrite8(127, ioaddr + TxDMAPollPeriod);
>> +
>
> what does the value 127 represent?
127 is polling period of Tx DMA to watch if there any packet need to send.
The 127 means 127*320ns.
(2)
> DownCounter should not be written unconditionally. Consider shared
> interrupts, where sundance performs no work, and handled==0.
DownCount is a the register that we can use for timer interrupt. When the
value of DownCount from 1 count down to 0 , IP100A will issue an interrupt.
prev parent reply other threads:[~2006-08-22 1:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-17 19:04 [PATCH 2/6] IP100A Fix Tx pause bug Jesse Huang
2006-08-18 11:27 ` Jeff Garzik
2006-08-22 1:17 ` Jesse Huang [this message]
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