From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <140e7ec30812042122l1f161410u51b1c10ad3897ef2@mail.gmail.com>
Date: Fri,  5 Dec 2008 14:22:18 +0900
From: sqweek <sqweek@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@9fans.net>
In-Reply-To: <27049442.3521101228145098701.JavaMail.nitido@priv-edtnes95>
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References: <27049442.3521101228145098701.JavaMail.nitido@priv-edtnes95>
Subject: Re: [9fans] image/memimage speed
Topicbox-Message-UUID: 5a7f819a-ead4-11e9-9d60-3106f5b1d025

On Tue, Dec 2, 2008 at 12:24 AM,  <plalonde@telus.net> wrote:
> I think the real performance issue for hardware where the frame buffer is in
> the PCIe shared memory apperture is that writes are write-through/coalesced
> on their way across the PCIe, but reads can't be, and so incur huge stalls.

 Hah, this sounds just like 9p's latency woes.
-sqweek