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

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Date:	Wed, 4 Dec 2013 00:22:08 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	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 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

>
> perf report
>
>
>


anything critical missing here?

perf]# make
  BUILD:   Doing 'make -j16' parallel build

Auto-detecting system features:
...                     backtrace: [ on  ]
...                         dwarf: [ on  ]
...                fortify-source: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ OFF ]
...                  gtk2-infobar: [ OFF ]
...                      libaudit: [ OFF ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...             libelf-getphdrnum: [ on  ]
...                   libelf-mmap: [ on  ]
...                       libnuma: [ OFF ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...             libpython-version: [ on  ]
...                      libslang: [ on  ]
...                     libunwind: [ OFF ]
...                       on-exit: [ on  ]
...                stackprotector: [ on  ]
...            stackprotector-all: [ on  ]
...                       timerfd: [ on  ]

config/Makefile:329: No libunwind found, disabling post unwind
support. Please install libunwind-dev[el] >= 1.1
config/Makefile:354: No libaudit.h found, disables 'trace' tool,
please install audit-libs-devel or libaudit-dev
config/Makefile:381: GTK2 not found, disables GTK2 support. Please
install gtk2-devel or libgtk2.0-dev
config/Makefile:536: No numa.h found, disables 'perf bench numa mem'
benchmark, please install numa-libs-devel or libnuma-dev
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