AF_UNIX/tcp bw regression in 2.6.6/2.6.7-rc1 compared to 2.4.22-2188.nptl

From: Yusuf Goolamabbas
Date: Mon May 24 2004 - 03:30:57 EST

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Hi, I ran lmbench 2.0.4 on a P3-500 with 384 MB ram box with the latest
Fedora Core 1 kernel (2.4.22-2188.nptl, 2.6.6 and 2.6.7-rc1 (CONFIG_REGPARM=y)

There seems to be regression in AF_UNIX/tcp bandwidth in 2.6.7-rc1
I did two runs per kernel

output from lmbench follows

cc: netdev in case this is of interest to networking hackers

L M B E N C H 2 . 0 S U M M A R Y
------------------------------------

Basic system parameters
----------------------------------------------------
Host OS Description Mhz

--------- ------------- ----------------------- ----
214.2.168 Linux 2.4.22- i686-pc-linux-gnu 407
214.2.168 Linux 2.4.22- i686-pc-linux-gnu 407
214.2.168 Linux 2.6.7-r i686-pc-linux-gnu 407
214.2.168 Linux 2.6.7-r i686-pc-linux-gnu 407
214.2.168 Linux 2.6.6 i686-pc-linux-gnu 407
214.2.168 Linux 2.6.6 i686-pc-linux-gnu 407

Processor, Processes - times in microseconds - smaller is better
----------------------------------------------------------------
Host OS Mhz null null open selct sig sig fork exec sh
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
214.2.168 Linux 2.4.22- 407 0.77 1.16 6.59 8.03 35.6 2.14 6.80 340. 1387 5802
214.2.168 Linux 2.4.22- 407 0.77 1.14 6.58 7.93 37.8 2.14 6.80 341. 1492 5980
214.2.168 Linux 2.6.7-r 407 0.42 0.72 7.01 8.14 28.2 1.99 7.67 383. 1381 5920
214.2.168 Linux 2.6.7-r 407 0.42 0.71 6.97 8.04 30.4 1.99 7.62 390. 1386 5949
214.2.168 Linux 2.6.6 407 0.42 0.74 6.93 8.19 28.0 1.99 7.03 425. 1412 6018
214.2.168 Linux 2.6.6 407 0.42 0.73 7.01 8.26 28.3 1.99 7.04 425. 1430 6083

Context switching - times in microseconds - smaller is better
-------------------------------------------------------------
Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw
--------- ------------- ----- ------ ------ ------ ------ ------- -------
214.2.168 Linux 2.4.22- 1.870 18.3 82.7 19.6 178.4 29.0 258.9
214.2.168 Linux 2.4.22- 1.970 18.2 52.4 23.6 182.3 36.9 260.4
214.2.168 Linux 2.6.7-r 2.840 20.7 88.7 22.1 185.0 30.7 271.7
214.2.168 Linux 2.6.7-r 2.900 20.7 57.3 35.7 192.2 44.7 265.8
214.2.168 Linux 2.6.6 2.280 19.3 54.5 20.6 190.8 34.7 268.6
214.2.168 Linux 2.6.6 2.490 19.2 54.3 28.1 164.6 32.5 266.3

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
214.2.168 Linux 2.4.22- 1.870 10.7 20.3 47.7 108.3 62.4 144.5 248.
214.2.168 Linux 2.4.22- 1.970 10.8 20.3 48.4 108.2 71.1 144.3 242.
214.2.168 Linux 2.6.7-r 2.840 12.4 31.6 52.6 113.4 71.9 141.2 249.
214.2.168 Linux 2.6.7-r 2.900 12.8 31.9 56.4 113.1 70.8 141.3 254.
214.2.168 Linux 2.6.6 2.280 11.0 21.5 51.1 112.0 75.0 149.2 252.
214.2.168 Linux 2.6.6 2.490 11.1 21.8 53.0 111.7 78.7 146.3 255.

File & VM system latencies in microseconds - smaller is better
--------------------------------------------------------------
Host OS 0K File 10K File Mmap Prot Page
Create Delete Create Delete Latency Fault Fault
--------- ------------- ------ ------ ------ ------ ------- ----- -----
214.2.168 Linux 2.4.22- 156.9 39.1 418.8 105.8 1946.0 0.427 3.00000
214.2.168 Linux 2.4.22- 156.8 39.1 434.8 98.9 1961.0 0.464 3.00000
214.2.168 Linux 2.6.7-r 150.2 31.8 406.5 105.1 2394.0 0.869 4.00000
214.2.168 Linux 2.6.7-r 150.2 31.5 406.5 105.0 2468.0 0.828 4.00000
214.2.168 Linux 2.6.6 147.1 30.4 406.2 103.8 2449.0 1.078 4.00000
214.2.168 Linux 2.6.6 147.6 30.3 401.8 105.1 2584.0 1.172 4.00000

*Local* Communication bandwidths in MB/s - bigger is better
-----------------------------------------------------------
Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem
UNIX reread reread (libc) (hand) read write
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
214.2.168 Linux 2.4.22- 186. 118. 85.9 148.8 229.9 75.5 56.2 230. 74.6
214.2.168 Linux 2.4.22- 194. 118. 71.8 146.8 230.7 75.5 56.1 230. 74.6
214.2.168 Linux 2.6.7-r 144. 99.1 58.8 144.4 228.4 73.0 55.6 228. 73.0
214.2.168 Linux 2.6.7-r 162. 99.0 62.7 143.6 228.2 72.7 55.5 228. 73.0
214.2.168 Linux 2.6.6 183. 108. 56.6 142.7 228.3 73.0 55.5 228. 72.9
214.2.168 Linux 2.6.6 174. 119. 64.5 144.3 228.1 73.2 55.5 228. 72.9

Memory latencies in nanoseconds - smaller is better
(WARNING - may not be correct, check graphs)
---------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem Guesses
--------- ------------- ---- ----- ------ -------- -------
214.2.168 Linux 2.4.22- 407 7.361 54.1 254.6
214.2.168 Linux 2.4.22- 407 7.362 54.1 254.6
214.2.168 Linux 2.6.7-r 407 7.468 55.0 257.7
214.2.168 Linux 2.6.7-r 407 7.468 86.5 257.5
214.2.168 Linux 2.6.6 407 7.469 55.2 257.8
214.2.168 Linux 2.6.6 407 7.468 55.2 257.8
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Next message: Luis R. Rodriguez: "[PATCH 0/14] prism54: bring up to sync with prism54.org cvs rep"
Previous message: bert hubert: "Re: [PATCH] Add FUTEX_CMP_REQUEUE futex op"
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