> There are some changes in the current -bk tree (which are a
> bit in-flux at the moment) which introduce some optimisations.
>
> They should bring 2-level performance close to par with 2.6.10.
> If not, complain again :)
The good news is that with a BK snapshot from today
[md5key=4238cb8e36_Z5Cgys8rTovspboIJpw] performance is rather
improved relative to 2.6.11 :
fork: 166 -> 187 -13%
exec: 857 -> 909 -6%
Rather better than -40%, but still not brilliant.
Any more improvements in the pipeline?
Ian
------------------------------------------------------------------------------
Host OS Mhz null null open slct sig sig fork exec sh
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
commando- Linux 2.6.10 2400 0.49 0.57 2.06 3.06 19.6 0.89 2.70 166. 857. 2972
commando- Linux 2.6.12 2400 0.49 0.60 2.37 3.43 20.9 0.91 2.64 187. 909. 3076
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
--------- ------------- ------ ------ ------ ------ ------ ------- -------
commando- Linux 2.6.10 7.5800 4.3300 8.1900 5.1100 33.1 8.37000 41.9
commando- Linux 2.6.12 7.7400 7.9200 8.3700 5.1600 27.0 9.32000 36.5
*Local* Communication latencies in microseconds - smaller is better
---------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
commando- Linux 2.6.10 7.750 19.4 21.3 37.2 45.5 42.5 53.2 76.
commando- Linux 2.6.12 7.740 18.2 23.1 37.4 45.6 42.6 54.9 80.
File & VM system latencies in microseconds - smaller is better
-------------------------------------------------------------------------------
Host OS 0K File 10K File Mmap Prot Page 100fd
Create Delete Create Delete Latency Fault Fault selct
--------- ------------- ------ ------ ------ ------ ------- ----- ------- -----
commando- Linux 2.6.10 39.3 16.2 92.7 35.2 122.0 1.200 2.14310 18.3
commando- Linux 2.6.12 38.7 16.4 94.1 35.1 148.0 1.029 2.25100 18.0
*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
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
commando- Linux 2.6.10 313. 440. 222. 1551.7 1528.5 549.1 566.8 1550 784.8
commando- Linux 2.6.12 556. 477. 224. 1540.3 1551.4 566.5 566.6 1551 786.2
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