netdev - Re: vxlan/veth performance issues on net.git + latest kernels

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Date:	Wed, 4 Dec 2013 00:35:37 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Or Gerlitz <or.gerlitz@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	Joseph Gasparakis <joseph.gasparakis@...el.com>,
	Jerry Chu <hkchu@...gle.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Pravin B Shelar <pshelar@...ira.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: vxlan/veth performance issues on net.git + latest kernels

On Wed, Dec 4, 2013 at 12:30 AM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> On Wed, Dec 04, 2013 at 12:22:08AM +0200, Or Gerlitz wrote:
>> On Tue, Dec 3, 2013 at 11:55 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> > On Tue, 2013-12-03 at 16:50 -0500, David Miller wrote:
>> >
>> >> At this point I would use drop monitor to figure out in what context
>> >> packets are being dropped on the floor.  There are scripts provided
>> >> with the perf tool to utilize it.
>> >
>> > Most easy way is to do :
>> >
>> > perf record -e skb:kfree_skb -a -g sleep 10
>>
>> some typo here? I tried the perf tool that comes with the net git
>>
>> ./perf record -e skb:kfree_skb -a -g sleep 10
>> invalid or unsupported event: 'skb:kfree_skb'
>> Run 'perf list' for a list of valid events
>>
>>  usage: perf record [<options>] [<command>]
>>     or: perf record [<options>] -- <command> [<options>]
>>
>>     -e, --event <event>   event selector. use 'perf list' to list
>> available events
>
> -g takes an optional argument. Reorder the arguments:
>
> perf record -e skb:kfree_skb -g -a sleep 10


Sorry, it doesn't help, I get the same error even with the oerf
kernel.org tree which has these events (no sign for skb's)


List of pre-defined events (to be used in -e):
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]
  cache-references                                   [Hardware event]
  cache-misses                                       [Hardware event]
  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  stalled-cycles-frontend OR idle-cycles-frontend    [Hardware event]
  stalled-cycles-backend OR idle-cycles-backend      [Hardware event]
  ref-cycles                                         [Hardware event]

  cpu-clock                                          [Software event]
  task-clock                                         [Software event]
  page-faults OR faults                              [Software event]
  context-switches OR cs                             [Software event]
  cpu-migrations OR migrations                       [Software event]
  minor-faults                                       [Software event]
  major-faults                                       [Software event]
  alignment-faults                                   [Software event]
  emulation-faults                                   [Software event]

  L1-dcache-loads                                    [Hardware cache event]
  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-stores                                   [Hardware cache event]
  L1-dcache-store-misses                             [Hardware cache event]
  L1-dcache-prefetches                               [Hardware cache event]
  L1-dcache-prefetch-misses                          [Hardware cache event]
  L1-icache-loads                                    [Hardware cache event]
  L1-icache-load-misses                              [Hardware cache event]
  L1-icache-prefetches                               [Hardware cache event]
  L1-icache-prefetch-misses                          [Hardware cache event]
  LLC-loads                                          [Hardware cache event]
  LLC-load-misses                                    [Hardware cache event]
  LLC-stores                                         [Hardware cache event]
  LLC-store-misses                                   [Hardware cache event]
  LLC-prefetches                                     [Hardware cache event]
  LLC-prefetch-misses                                [Hardware cache event]
  dTLB-loads                                         [Hardware cache event]
  dTLB-load-misses                                   [Hardware cache event]
  dTLB-stores                                        [Hardware cache event]
  dTLB-store-misses                                  [Hardware cache event]
  dTLB-prefetches                                    [Hardware cache event]
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