netdev - Re: TCP communication for raw image transmission

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Date:	Thu, 05 Jan 2012 10:49:36 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jean-Michel Hautbois <jhautbois@...il.com>
Cc:	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org
Subject: Re: TCP communication for raw image transmission

Le jeudi 05 janvier 2012 à 10:40 +0100, Eric Dumazet a écrit :

> Could you test UDP_STREAM as well ?
> 
> $ netperf -H 192.168.0.1 -l 10 -t UDP_STREAM
> UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 192.168.0.1 (192.168.0.1) port 0 AF_INET
> Socket  Message  Elapsed      Messages                
> Size    Size     Time         Okay Errors   Throughput
> bytes   bytes    secs            #      #   10^6bits/sec
> 
> 1000000   65507   10.00       13398      0     702.12
> 110592           10.00       13398            702.12
> 

Ah, I had a special BQL setup, this explains I didnt reach line rate.

After doing :

$ echo max >/sys/class/net/eth3/queues/tx-0/byte_queue_limits/limit_max

I get line rate :

$ grep . /sys/class/net/eth3/queues/tx-0/byte_queue_limits/*
/sys/class/net/eth3/queues/tx-0/byte_queue_limits/hold_time:1000
/sys/class/net/eth3/queues/tx-0/byte_queue_limits/inflight:154294
/sys/class/net/eth3/queues/tx-0/byte_queue_limits/limit:152852
/sys/class/net/eth3/queues/tx-0/byte_queue_limits/limit_max:1879048192
/sys/class/net/eth3/queues/tx-0/byte_queue_limits/limit_min:0


perf record netperf -H 192.168.0.1 -l 10 -t UDP_STREAM -- -m 1400
UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
192.168.0.1 (192.168.0.1) port 0 AF_INET
Socket  Message  Elapsed      Messages                
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

1000000    1400   10.00      853120      0     955.49
110592           10.00      852799            955.13

[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.155 MB perf.data (~6779 samples) ]

$ perf report --stdio
# ========
# captured on: Thu Jan  5 10:45:29 2012
# hostname : svivoipvnx001
# os release : 3.2.0-rc7-15182-g3b9b886-dirty
# perf version : 3.2.rc7.272.ga1b347.dirty
# arch : i686
# nrcpus online : 8
# nrcpus avail : 8
# cpudesc : Intel(R) Xeon(R) CPU E5450 @ 3.00GHz
# cpuid : GenuineIntel,6,23,6
# total memory : 4147856 kB
# cmdline : /usr/bin/perf record netperf -H 192.168.0.1 -l 10 -t UDP_STREAM -- -m 1400 
# event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, id = { 65, 66
# HEADER_CPU_TOPOLOGY info available, use -I to display
# ========
#
# Events: 3K cycles
#
# Overhead  Command      Shared Object                                Symbol
# ........  .......  .................  ....................................
#
    54.87%  netperf  [kernel.kallsyms]  [k] __copy_from_user_ll
     5.93%  netperf  [kernel.kallsyms]  [k] __ip_make_skb
     5.00%  netperf  [kernel.kallsyms]  [k] __ip_append_data.clone.64
     2.23%  netperf  [kernel.kallsyms]  [k] __alloc_skb
     2.06%  netperf  [kernel.kallsyms]  [k] sysenter_past_esp
     1.94%  netperf  [ip_tables]        [k] ipt_do_table
     1.78%  netperf  [kernel.kallsyms]  [k] udp_sendmsg
     1.58%  netperf  [kernel.kallsyms]  [k] __ip_route_output_key
     1.48%  netperf  [kernel.kallsyms]  [k] sock_alloc_send_pskb
     1.10%  netperf  [kernel.kallsyms]  [k] udp_send_skb
     1.07%  netperf  [kernel.kallsyms]  [k] ip_finish_output
     1.04%  netperf  [kernel.kallsyms]  [k] __kmalloc_track_caller
     1.03%  netperf  [kernel.kallsyms]  [k] memcpy
     0.97%  netperf  [kernel.kallsyms]  [k] local_bh_enable
     0.88%  netperf  [kernel.kallsyms]  [k] __slab_alloc.clone.58
     0.88%  netperf  [kernel.kallsyms]  [k] __ip_local_out
     0.82%  netperf  [unknown]          [.] 0xffffe424
     0.80%  netperf  [kernel.kallsyms]  [k] kmem_cache_alloc
     0.73%  netperf  [kernel.kallsyms]  [k] nf_iterate
     0.71%  netperf  [kernel.kallsyms]  [k] pfifo_fast_enqueue
     0.70%  netperf  [kernel.kallsyms]  [k] _raw_spin_lock
     0.69%  netperf  [kernel.kallsyms]  [k] _copy_from_user
     0.58%  netperf  [kernel.kallsyms]  [k] dev_queue_xmit
     0.54%  netperf  [kernel.kallsyms]  [k] ipv4_mtu
     0.50%  netperf  [kernel.kallsyms]  [k] ipv4_validate_peer
     0.46%  netperf  [kernel.kallsyms]  [k] ksize
     0.46%  netperf  [kernel.kallsyms]  [k] sys_sendto
     0.44%  netperf  [kernel.kallsyms]  [k] nf_hook_slow
     0.39%  netperf  netperf            [.] send_udp_stream
     0.38%  netperf  [kernel.kallsyms]  [k] sock_sendmsg



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