From: Francois Romieu <romieu@cogenit.fr>
To: Jawad Qureshi <qureshi_jawad@usa.net>
Cc: linux-mm@kvack.org
Subject: Re: Non PCI bursting cards should go to the trash can
Date: Fri, 16 Mar 2001 12:49:59 +0100 [thread overview]
Message-ID: <20010316124959.A407@se1.cogenit.fr> (raw)
In-Reply-To: <20010315062806.24508.qmail@nwcst340.netaddress.usa.net>; from qureshi_jawad@usa.net on Wed, Mar 14, 2001 at 11:28:06PM -0700
Jawad Qureshi <qureshi_jawad@usa.net> ecrit :
[...]
> I am facing some problems with the pci. I have two questions about Pci.
> First is that
> 1-how one can explicitly specify to brust on the pci device;
> 2-We have a custom made pci card . The problem is that the transfer on this
> card is slow. I am making 40 double word transfers from the fifoes on the
> board to the memory. The pci card does not allow brusts. These transfers are
> taking almost 32us. Can any body tell why this much time is taking place.
32us/40 = 800ns. PCI at 33MHz, cycle = 33ns -> 24 cycle/access.
The *address* phase of a PCI r/w cycle eats 6 cycles for himself at least.
It looks rather normal.
--
Ueimor
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prev parent reply other threads:[~2001-03-16 11:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-15 6:28 Jawad Qureshi
2001-03-16 11:49 ` Francois Romieu [this message]
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