From: "David S. Miller" <davem@redhat.com>
To: scott.feldman@intel.com
Cc: anton@samba.org, haveblue@us.ibm.com, hdierks@us.ibm.com,
dwg@au1.ibm.com, linux-kernel@vger.kernel.org,
milliner@us.ibm.com, ricardoz@us.ibm.com, twichell@us.ibm.com,
netdev@oss.sgi.com
Subject: Re: e1000 performance hack for ppc64 (Power4)
Date: Fri, 13 Jun 2003 16:52:50 -0700 (PDT) [thread overview]
Message-ID: <20030613.165250.41635765.davem@redhat.com> (raw)
In-Reply-To: <C6F5CF431189FA4CBAEC9E7DD5441E010107D93A@orsmsx402.jf.intel.com>
From: "Feldman, Scott" <scott.feldman@intel.com>
Date: Fri, 13 Jun 2003 16:52:18 -0700
> > Why not instead find out if it's possible to have the e1000
> > fetch the entire cache line where the first byte of the
> > packet resides? Even ancient designes like SunHME do that.
>
> Rusty and I were wondering why the e1000 didnt do that exact thing.
>
> Scott: is it possible to enable such a thing?
I thought the answer was no, so I double checked with a couple of
hardware guys, and the answer is still no.
Sigh...
So Anton, when the PCI controller gets a set of sub-cacheline word
reads from the device, it reads the value from memory once for every
one of those words? ROFL, if so... I can't believe they wouldn't
put caches on the PCI controller for this, at least a one-behind that
snoops the bus :(
next prev parent reply other threads:[~2003-06-13 23:52 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-13 23:52 e1000 performance hack for ppc64 (Power4) Feldman, Scott
2003-06-13 23:52 ` David S. Miller [this message]
2003-06-14 0:55 ` Anton Blanchard
2003-06-14 1:34 ` David S. Miller
2003-06-14 0:03 ` Anton Blanchard
-- strict thread matches above, loose matches on Subject: below --
2003-06-16 18:56 Feldman, Scott
2003-06-16 18:21 Feldman, Scott
2003-06-16 18:30 ` Dave Hansen
2003-06-15 14:40 Herman Dierks
2003-06-15 14:44 ` David S. Miller
2003-06-16 16:17 ` Nivedita Singhvi
2003-06-15 14:32 Herman Dierks
2003-06-13 17:03 Herman Dierks
[not found] <OF0078342A.E131D4B1-ON85256D44.0051F7C0@pok.ibm.com>
2003-06-13 16:21 ` Dave Hansen
2003-06-13 22:38 ` Anton Blanchard
2003-06-13 22:46 ` David S. Miller
2003-06-13 23:18 ` Anton Blanchard
2003-06-14 1:52 ` Lincoln Dale
2003-06-14 5:41 ` David S. Miller
2003-06-14 5:52 ` Lincoln Dale
2003-06-14 6:08 ` David S. Miller
2003-06-14 6:14 ` David S. Miller
2003-06-14 6:27 ` William Lee Irwin III
2003-06-14 17:08 ` Greg KH
2003-06-15 3:01 ` David S. Miller
2003-06-14 5:16 ` Nivedita Singhvi
2003-06-14 5:36 ` David S. Miller
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