LMbench results for 2.5.40

Patrick Mau
2002-10-01T22:03:29Z

Hallo,

these are LMbench results for 2.4.18 and 2.5.40 (two runs).
All results where obtained in single-user mode after a fresh
reboot.

2.5.40 was compiled with CONFIG_PREEMPT=n.

Could someone explain the results I marked with '???' ?
The ones under 'Local Communication Bandwidth'.

Patrick

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

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

--------- ------------- ----------------------- ----
tony Linux 2.4.18 i686-pc-linux-gnu 2400
tony Linux 2.5.40 i686-pc-linux-gnu 2400
tony Linux 2.5.40 i686-pc-linux-gnu 2400

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
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
tony Linux 2.4.18 2400 0.67 0.75 1.42 2.29 6.637 1.12 2.71 93.5 445. 6145
tony Linux 2.5.40 2400 0.66 0.77 1.51 2.41 6.830 1.14 2.83 116. 499. 6779
tony Linux 2.5.40 2400 0.66 0.76 1.51 2.38 6.527 1.14 2.82 117. 512. 6577

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
--------- ------------- ----- ------ ------ ------ ------ ------- -------
tony Linux 2.4.18 0.750 1.7800 4.3400 1.8500 23.8 3.85000 30.1
tony Linux 2.5.40 1.130 1.8300 4.4200 2.0900 21.7 4.37000 30.6
tony Linux 2.5.40 1.170 1.9300 4.4100 2.4100 21.8 3.70000 30.6

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
tony Linux 2.4.18 0.750 4.979 7.29 12.9 23.2 14.3 28.0 44.1
tony Linux 2.5.40 1.130 5.200 7.97 13.5 23.4 15.3 28.9 47.8
tony Linux 2.5.40 1.170 5.575 8.02 13.7 23.8 15.2 29.6 47.9

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
--------- ------------- ------ ------ ------ ------ ------- ----- -----
tony Linux 2.4.18 29.6 5.6840 56.9 10.4 1190.0 1.310 2.00000
tony Linux 2.5.40 31.9 6.4960 61.2 14.4 1444.0 1.360 2.00000
tony Linux 2.5.40 31.9 6.4530 60.5 14.4 1445.0 1.346 2.00000

*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
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
tony Linux 2.4.18 1538 2303 1301 1967.1 2007.9 855.8 898.3 2004 1099.
tony Linux 2.5.40 1360 2190 303. 1827.6 1979.3 804.8 857.5 1976 1201.
tony Linux 2.5.40 1231 2140 309. 1836.3 1980.1 831.2 886.1 1979 1319.
????

Memory latencies in nanoseconds - smaller is better
(WARNING - may not be correct, check graphs)
---------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem Guesses
--------- ------------- ---- ----- ------ -------- -------
tony Linux 2.4.18 2400 0.838 7.6860 118.2
tony Linux 2.5.40 2400 0.862 7.7870 123.8
tony Linux 2.5.40 2400 0.837 7.7820 123.0