From owner-freebsd-stable  Thu Jul 12 15:14:42 2001
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From: "Juha Saarinen" <juha@saarinen.org>
To: "'Matt Dillon'" <dillon@earth.backplane.com>
Cc: "'Jonathan Fortin'" <jfortin@akalink.com>,
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Subject: RE: RE: Regarding New FreeBSD BenchMark From Sysadmin Mag (left out a fiew tuning options)
Date: Fri, 13 Jul 2001 10:14:52 +1200
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::     SCSI drives have tags, you don't have to lift a finger.  
:: Turning on
::     write caching on top of using tags is extremely dangerous anyway,
::     much more dangerous then turning on write caching for an 
:: (untagged)
::     IDE drive.

You mean tagged command queueing?

da0 at sym0 bus 0 target 0 lun 0
da0: <IBM DDYS-T36950N S93E> Fixed Direct Access SCSI-3 device
da0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing
Enabled
da0: 35003MB (71687340 512 byte sectors: 255H 63S/T 4462C)
da1 at sym0 bus 0 target 1 lun 0
da1: <IBM DDYS-T36950N S93E> Fixed Direct Access SCSI-3 device
da1: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing
Enabled
da1: 35003MB (71687340 512 byte sectors: 255H 63S/T 4462C)


Does the 'debug.vfscache' sysctl hurt performance? It's set to '1' by
default in 4.3-STABLE by the looks of it.

-- Juha


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