FreeBSD 5.3b7and poor ata performance

Søren Schmidt sos at DeepCore.dk
Mon Oct 25 03:35:53 PDT 2004


fandino wrote:

> However I would like to know disk performance of list members using a
> VIA 82C686B chipset. Anyone in the list is using this chipset?

I do:
atapci0: <VIA 82C686B UDMA100 controller> port 0xd000-0xd00f at device 
7.1 on pci0
...
ad0: 39205MB <Maxtor 6E040L0> [79656/16/63] at ata0-master UDMA100

Diskinfo -t yields:

Seek times:
         Full stroke:      250 iter in   5.378885 sec =   21.516 msec
         Half stroke:      250 iter in   4.154826 sec =   16.619 msec
         Quarter stroke:   500 iter in   6.640011 sec =   13.280 msec
         Short forward:    400 iter in   2.911354 sec =    7.278 msec
         Short backward:   400 iter in   2.370054 sec =    5.925 msec
         Seq outer:       2048 iter in   0.267370 sec =    0.131 msec
         Seq inner:       2048 iter in   0.266306 sec =    0.130 msec
Transfer rates:
         outside:       102400 kbytes in   1.933641 sec =    52957 
kbytes/sec
         middle:        102400 kbytes in   1.934147 sec =    52943 
kbytes/sec
         inside:        102400 kbytes in   2.761984 sec =    37075 
kbytes/sec


Mind you this server is active as mail/www/gateway so the numbers are to 
be taken with a bit of salt, and that Maxtor disk is probably the 
slowest disk they make at all these days, anyhow the numbers above fits 
the specs pretty close...

-- 

-Søren




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