Messages in this thread | | | Date | Mon, 15 Apr 2002 18:18:33 +0200 | From | Jens Axboe <> | Subject | Re: [PATCH] IDE TCQ #4 |
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On Mon, Apr 15 2002, Aaron Tiensivu wrote: > Simple question but hopefully it has a simple answer.. is there a command > you can issue or flag you can look for from the output of hdparm to tell if > your hard drive is capable of TCQ before installing the patch? I have a few > IBM drives that I'm sure have TCQ abilities but I don't trust them as far as > I can throw them (being Hungarian and cursed) but I'd like to give TCQ a > whirl on my WD 120GB drives that should work OK, if they support TCQ.. > > Sorry if it's already been asked.. :)
It has not been asked :-)
You can run a IDENTIFY_DEVICE from user space with the task ioctls and look at word 83 -- bit 1 and 14 must be set for TCQ to be supported. If you give me the model identifier from the IBM drive, I can tell you if it has tcq or not...
I'll write a small util to detect this tomorrow and send it to you + the list.
I thought only the IBM's had TCQ, but I got one report today indicating that some WD do too.
-- Jens Axboe
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