Re: [PATCH] use mmiowb in tg3_poll

[jamal <hadi@xxxxxxxxxx>]

On Mon, 2005-30-05 at 09:30 -0700, Arthur Kepner wrote:

> I quickly looked through the records that I have and, unfortunately, 
> wasn't able to locate raw data. But I found some scrawlings in my 
> notes which say the most recent measurements for an Altix are: 
> 
>       i)  PIO read latency ~ 2.4 usec
>       ii) mmiowb() latency ~ 1.1 usec
> 


In terms of CPU cycles, how many do the above compute to be?
The absolute time numbers you have are also useful for quantification
purposes.

Did i read correctly that your reads are about 2x more expensive than
the writes?

cheers,
jamal