[Stgt-devel] More threads for device server

Mike Christie michaelc at cs.wisc.edu
Mon Sep 5 05:53:13 CEST 2005

FUJITA Tomonori wrote:
> From: Mike Christie <michaelc at cs.wisc.edu>
> Subject: Re: [Stgt-devel] More threads for device server
> Date: Sun, 04 Sep 2005 21:05:12 -0500
>>>The current code uses work queue for performing SCSI commands (or
>>>block target's tasks). Work queue is simple and good enough for
>>>debugging, however, a single thread per CPU is not good enough (from
>>>the performance perspective).
>>>I thought about creating multiple kernel threads by hand. Are there
>>>handy APIs?
>>you can create a single threaded workqueue per target or session?
> The vfs APIs work synchronously. So we need multiple threads per
> target (or session) to perform several SCSI commands simultaneously.
> If we always use asynchronous block I/O APIs (like AIO vfs,
> submit_bio, etc), a single threaded workqueue would be fine.

Hey what was the submit_bio idea though? Is there a way o do that and 
still get to use the systems cache?

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