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Re: [Fedora-ia64-list] RFC: Thoughts on SPARSE memory
- From: Doug Chapman <dchapman redhat com>
- To: ia64 Fedora Core Development <fedora-ia64-list redhat com>
- Subject: Re: [Fedora-ia64-list] RFC: Thoughts on SPARSE memory
- Date: Mon, 24 Jul 2006 16:37:33 -0400
lmbench-2.5 on a 4cpu HP Integrity rx4640 with discontiguous and sparse
memory configurations. Kernel was kernel-2.6.17-1.2439. Both kernels
were compiled on this system to ensure consistency.
I will run some stress testing to check for regressions on sparse.
L M B E N C H 2 . 0 S U M M A R Y
------------------------------------
Basic system parameters
----------------------------------------------------
Host OS Description Mhz
--------- ------------- ----------------------- ----
dist Linux 2.6.17- ia64-linux-gnu 1499
sparsemem Linux 2.6.17- ia64-linux-gnu 1499
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
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
dist Linux 2.6.17- 1499 0.03 0.30 23.6 27.1 8.474 0.33 3.40 107. 520. 2417
sparsemem Linux 2.6.17- 1499 0.03 0.29 23.7 27.0 8.477 0.33 3.47 108. 523. 2431
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
--------- ------------- ----- ------ ------ ------ ------ ------- -------
dist Linux 2.6.17- 1.900 3.1900 6.5900 4.9200 10.7 4.76000 10.8
sparsemem Linux 2.6.17- 1.870 3.0000 6.2900 3.4600 10.6 4.50000 10.5
*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
dist Linux 2.6.17- 1.900 46.8 68.2 35.5 28.1 198.5 212.3 97.9
sparsemem Linux 2.6.17- 1.870 48.0 70.3 48.2 42.8 198.9 211.8 98.2
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
--------- ------------- ------ ------ ------ ------ ------- ----- -----
dist Linux 2.6.17- 33.6K 0.581
sparsemem Linux 2.6.17- 34.4K 0.586
*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
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
dist Linux 2.6.17- 1332 183. 169. 43120M 746.7 713.9 481.0 746. 667.9
sparsemem Linux 2.6.17- 1323 183. 168. 43144M 746.8 702.0 481.3 746. 673.9
Memory latencies in nanoseconds - smaller is better
(WARNING - may not be correct, check graphs)
---------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem Guesses
--------- ------------- ---- ----- ------ -------- -------
dist Linux 2.6.17- 1499 - - - Bad mhz?
sparsemem Linux 2.6.17- 1499 - - - Bad mhz?
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