[Fault-injection-developer] RFC: Solution to page fault relatived performance issue
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[Fault-injection-developer] RFC: Solution to page fault relatived performance issue
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From: Wang, S. <sta...@in...> - 2002-12-17 02:56:28
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Hi, folks
According to Kevin's test results, we could found the kernel with fi has
a serious performance depress on page fault relatived operation.
How about use hash table instead array to store the WP?
-Stan
-----Original Message-----
From: Gao, Kevin [mailto:kev...@in...]
Sent: 2002?12?17? 9:10
To: 'fau...@so...'
Subject: [Fault-injection-developer] Result of lmbench
L M B E N C H 2 . 0 S U M M A R Y
------------------------------------
Basic system parameters
----------------------------------------------------
Host OS Description Mhz
--------- ------------- ----------------------- ----
51-fi Linux 2.5.51 i686-pc-linux-gnu 932
51-pure Linux 2.5.51 i686-pc-linux-gnu 932
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
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ----
----
51-fi Linux 2.5.51 932 0.37 0.72 23.2 24.5 31.5 1.09 4.44 231. 1078
5299
51-pure Linux 2.5.51 932 0.37 0.70 23.0 24.4 31.8 1.07 4.64 216. 1013
5069
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
--------- ------------- ----- ------ ------ ------ ------ ------- -------
51-fi Linux 2.5.51 1.180 7.8700 17.2 6.1600 98.0 14.4 103.8
51-pure Linux 2.5.51 1.190 7.5300 16.9 5.9600 95.6 16.8 103.1
*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
51-fi Linux 2.5.51 1.180 6.949 15.3 27.4 49.4 86.5 91.9 133.
51-pure Linux 2.5.51 1.190 34.0 14.9 26.3 49.9 66.8 108.6 110.
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
--------- ------------- ------ ------ ------ ------ ------- ----- -----
51-fi Linux 2.5.51 90.7 45.6 217.9 74.9 2492.0 1.519 3.00000
51-pure Linux 2.5.51 90.7 45.5 216.4 75.1 1995.0 0.966 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
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ----
-----
51-fi Linux 2.5.51 369. 165. 44.6 446.2 557.5 242.2 175.7 557.
236.4
51-pure Linux 2.5.51 394. 164. 40.6 448.0 549.6 241.4 174.2 557.
235.7
Memory latencies in nanoseconds - smaller is better
(WARNING - may not be correct, check graphs)
---------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem Guesses
--------- ------------- ---- ----- ------ -------- -------
51-fi Linux 2.5.51 932 3.220 7.5140 100.8
51-pure Linux 2.5.51 932 3.220 7.5150 100.9
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