linux-kernel - Re: Posted Write onto a PCI end point device using Linux

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Message-ID: <4CFEE38E.3020500@gmail.com>
Date:	Tue, 07 Dec 2010 19:46:54 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Sanka Piyaratna <cesanka@...oo.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Posted Write onto a PCI end point device using Linux

On 12/07/2010 05:29 AM, Sanka Piyaratna wrote:
> Hi,
>
>
> I am wondering whether it is possible to issue a posted write using the host
> computer's root complex towards an PCI express end point. I have done this using
>
> DMA in the past. However, if posted writes are possible that would save a lot of
>
> time and effort and would be quicker too.

Writes from the CPU to PCI memory are always posted. However, the posted 
write buffer size is usually quite limited and so this probably will 
still cause CPU overhead when writing any significant amount of data 
this way.
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