From: Damien Millescamps <damien.millescamps@6wind.com>
To: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 0/7] Vyatta patches
Date: Fri, 31 May 2013 11:29:09 +0200 [thread overview]
Message-ID: <51A86D65.2090003@6wind.com> (raw)
In-Reply-To: <20130530171234.301927271@vyatta.com>
On 05/30/2013 07:12 PM, Stephen Hemminger wrote:
> One fix not included is the NUMA cpu assignment. The original Intel code
> in 1.2 incorrectly used /proc/cpuinfo to try and assign CPU's to NUMA socket.
> The problem is that /proc/cpuinfo physical_id corresponds to what the BIOS
> tells the kernel and is intended for messages only. For example, on our
> Dell boxes the first CPU and only CPU is reported as physical_id 1!
> The fix is to use sysfs instead,
Hi Stephen,
Are you using the
/sys/devices/system/node/nodeX/cpuX/topology/physical_package_id special
file ?
If so, then it is only usable starting from Kernel 3.3 according to this
fix:
http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=64be4c1c2428e148de6081af235e2418e6a66dda
The value returned for kernel prior to 3.3 is really not better than the
one from /proc/cpuinfo, so that's kind of a robbing Peter to pay Paul
example...
There is obviously a problem with the NUMA node ID detection right now
since both /proc/cpuinfo and /sys can return incorrect values, however
the node and cpu numbering is always good in the kernel boot log from
what I know. So there might be a better way to find the real node ID
whatever the kernel version used.
Cheers,
--
Damien Millescamps
next prev parent reply other threads:[~2013-05-31 9:29 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-30 17:12 Stephen Hemminger
2013-05-30 17:12 ` [dpdk-dev] [PATCH 1/7] [PATCH 4/8] igb: workaround errata with wthresh on 82576 Stephen Hemminger
2013-06-05 14:22 ` Vincent JARDIN
2013-06-12 10:06 ` [dpdk-dev] [PATCH 1/7] " Thomas Monjalon
2013-05-30 17:12 ` [dpdk-dev] [PATCH 2/7] rte_timer: optimize for empty case Stephen Hemminger
2013-06-05 14:25 ` Vincent JARDIN
2013-06-12 10:07 ` Thomas Monjalon
2013-05-30 17:12 ` [dpdk-dev] [PATCH 3/7] optimize log/panic Stephen Hemminger
2013-06-05 14:34 ` Vincent JARDIN
2013-06-12 10:09 ` Thomas Monjalon
2013-05-30 17:12 ` [dpdk-dev] [PATCH 4/7] eal: support different modules Stephen Hemminger
2013-06-03 8:58 ` Damien Millescamps
2013-06-03 15:41 ` Stephen Hemminger
2013-06-03 16:36 ` Thomas Monjalon
2013-06-03 17:26 ` Stephen Hemminger
2013-06-04 9:17 ` Damien Millescamps
2013-06-03 16:08 ` Antti Kantee
2013-06-03 16:29 ` Thomas Monjalon
2013-06-03 17:25 ` Stephen Hemminger
2013-06-03 18:40 ` Antti Kantee
2013-05-30 17:12 ` [dpdk-dev] [PATCH 5/7] pci: support multiple PCI regions per device Stephen Hemminger
2013-06-03 16:41 ` Thomas Monjalon
2013-06-05 14:50 ` Damien Millescamps
2013-06-05 15:49 ` Stephen Hemminger
2013-06-05 18:05 ` Damien Millescamps
2013-06-05 21:33 ` Stephen Hemminger
2013-06-18 1:28 ` somnath kotur
2013-07-16 8:53 ` Thomas Monjalon
2013-07-19 16:44 ` Stephen Hemminger
2013-05-30 17:12 ` [dpdk-dev] [PATCH 6/7] igb_uio: pci_block_user_cfg_access is unsafe, remove it Stephen Hemminger
2013-05-30 17:12 ` [dpdk-dev] [PATCH 7/7] eal: add ability to override DPDK syslog parameters Stephen Hemminger
2013-06-05 14:36 ` Vincent JARDIN
2013-06-12 10:18 ` Thomas Monjalon
2013-05-30 22:20 ` [dpdk-dev] [PATCH 0/7] Vyatta patches Thomas Monjalon
2013-05-31 9:29 ` Damien Millescamps [this message]
2013-05-31 15:45 ` Stephen Hemminger
2013-05-31 16:44 ` Damien Millescamps
2013-05-31 17:00 ` Stephen Hemminger
2013-06-03 15:22 ` Thomas Monjalon
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