Re: 2.4.26 and MPC885 context switching time
From: Wolfgang Denk <hidden>
Date: 2005-06-15 23:39:11
In message [ref] you wrote:
I did once ran lmbench on a proprietry 850 based board running at
62/31 Mhz using 1 16-bit dram:
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
--------- ------------- ----- ------ ------ ------ ------ -------
-------
test Linux 2.4.25- 259.2 234.2 302.6 304.7
This is ~ 3x faster then your 100Mhz 885...
I just ran lmbench on a MPC866 system (CPU at 132 MHz, bus at 66 MHz):
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
--------- ------------- ------ ------ ------ ------ ------ ------- -------
tqm8xx Linux 2.4.25 5.4500 27.5 30.3 39.0 36.0 37.7 33.5
There is definitely something wrong with Peter's measurements.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
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