From: David Miller <davem@davemloft.net>
To: peter.p.waskiewicz.jr@intel.com
Cc: jeffrey.t.kirsher@intel.com, netdev@vger.kernel.org, gospo@redhat.com
Subject: Re: [net-next-2.6 PATCH 2/5] ixgbe: Make descriptor ring allocations NUMA-aware
Date: Fri, 08 Jan 2010 00:31:22 -0800 (PST) [thread overview]
Message-ID: <20100108.003122.82929917.davem@davemloft.net> (raw)
In-Reply-To: <Pine.WNT.4.64.1001080023050.15320@ppwaskie-MOBL2.amr.corp.intel.com>
From: "Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@intel.com>
Date: Fri, 8 Jan 2010 00:25:26 -0800 (Pacific Standard Time)
> In our hardware (82598 and 82599), the CPU field in the DCA registers is 8
> bits.
>
> The reason I truncated this was to fit these values into the
> first cacheline of the struct. I also didn't figure we'd see a system
> that would have 255 NUMA nodes before 10 GbE was something that was on the
> shelf collecting dust. :-)
The X86 port supports 9 for "NODES_SHIFT", and up to 4096 cpus.
Even when !MAXSMP, the cpu limit is 512.
Don't make the type ungeneric just because some current piece of
hardware has that limitation. This is how subtle bugs slip into the
tree, and it makes auditing for such bugs a nightmare.
Thanks.
next prev parent reply other threads:[~2010-01-08 8:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-07 4:48 [net-next-2.6 PATCH 1/5] ixgbe: Allocate driver resources per NUMA node Jeff Kirsher
2010-01-07 4:48 ` [net-next-2.6 PATCH 2/5] ixgbe: Make descriptor ring allocations NUMA-aware Jeff Kirsher
2010-01-08 8:21 ` David Miller
2010-01-08 8:25 ` Waskiewicz Jr, Peter P
2010-01-08 8:31 ` David Miller [this message]
2010-01-08 8:36 ` Waskiewicz Jr, Peter P
2010-01-07 4:49 ` [net-next-2.6 PATCH 3/5] ethtool: Introduce n-tuple filter programming support Jeff Kirsher
2010-01-08 8:23 ` David Miller
2010-01-08 8:34 ` Waskiewicz Jr, Peter P
2010-01-08 8:38 ` David Miller
2010-01-08 8:42 ` Waskiewicz Jr, Peter P
2010-01-11 19:32 ` Ben Hutchings
2010-01-12 19:13 ` Waskiewicz Jr, Peter P
2010-01-21 2:54 ` David Miller
2010-01-07 4:49 ` [net-next-2.6 PATCH 4/5] ixgbe: Add Flow Director configuration support as a mod parameter Jeff Kirsher
2010-01-08 8:24 ` David Miller
2010-01-08 8:28 ` Waskiewicz Jr, Peter P
2010-01-08 8:32 ` David Miller
2010-01-08 8:36 ` Waskiewicz Jr, Peter P
2010-01-07 4:49 ` [net-next-2.6 PATCH 5/5] ixgbe: Add support for the new ethtool n-tuple programming interface Jeff Kirsher
2010-01-08 8:26 ` David Miller
2010-01-14 11:02 ` [net-next-2.6 PATCH 1/5] ixgbe: Allocate driver resources per NUMA node Andi Kleen
2010-01-19 16:10 ` Waskiewicz Jr, Peter P
2010-01-19 19:34 ` Andi Kleen
2010-01-19 19:34 ` Waskiewicz Jr, Peter P
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