--8323328-59187499-892397794=:395
Content-Type: TEXT/PLAIN; charset=US-ASCII
I have attached to this mail my latest version of the SMP changes for
the ncr53c8xx driver. The patch is against linux-2.1.95/driver 2.5f.?.
This patch still uses a lock per controller even if this seems not
needed for current Linux and very probably for linux-2.2.
Linux-2.1.95 uses a lock named 'io_request_lock' that seems to be a
global lock for the entire block IO subsystem. The way that have been
chosen to fix the SMP block IO stuff is to let all the components of
the block IO stuff be aware of the 'io_request_lock', including low-level
drivers.
Looking into the code, and assuming that I did understand correctly this
code, I ended up agreeing that it is likely the quickest and most
pragmatic way to fix up the SCSI code for SMP.
This patch will be included into the 2.1.9X kernel, only if Linus is
ok about, given that the current ncr driver code should behave correctly.
In any case, this patch (or the final one) will be available at
linux.wauug.org when it will be complete and tested ok.
Disadvantages of this patch:
- A couple of n/usec lost to uselessly lock the controller data.
- It is large (20 Kb).
Advantages:
- It is not broken by design IMO, and allows the driver to be more
resistant to bugs or bad changes in the block IO subsystem.
- The most part of the interrupt code is grained as wished.
Regards, Gerard.
--8323328-59187499-892397794=:395
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