Messages in this thread | | | Date | Wed, 10 Dec 2003 03:51:00 +0100 | From | Xose Vazquez Perez <> | Subject | Re: bad performance on 2.4.23 |
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Marcelo Tosatti wrote:
> About the high numbers on -ac and -aa: > > -ac includes rmap and the drop_behind() logic (I just posted the patch > against 2.4.23 to lkml). I believe its the reason for the read slowdowns > reported on lkml. > > -aa includes this patch which will increase the max readahead > significantly. Mind trying it?
Sorry. I don't have any free machine to do this kind of tests. :(
>>In 'Sequential Reads' and 'Sequential Writes', 'Maximum Latency' is _too much high_ >> >>2.4.23-pre4 8192 4096 256 5.10 6.83% 430.551 1602091.53 0.35501 0.31585 75 >>2.4.23-rc1 8192 4096 256 5.04 6.94% 432.486 1937701.66 0.33408 0.29884 73
> Now this is really odd. When did it started happening?
It looks like between .20 and .23, included.
Test was done by Randy Hron <rwhron@earthlink.net> over a OSDL server: 4x700 mhz Pentium III Xeons with 1MB cache 3.75 GB RAM DAC960 Fiber channel to SCSI disks in RAID5 configuration more details at http://home.earthlink.net/~rwhron/kernel/bigbox.html
what is very strange is that in two different tests and kernels (2.4.23-pre4 and2.4.23-rc1) 'Maximum Latency' is very high with 256 threads.
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