Ric Wheeler wrote:
Mark Lord wrote:
Tejun Heo wrote:
..
Right. Also, we need to snoop some passthrough commands and
revalidate/reconfigure when configuration is explicitly changed.
Once the sysfs attr's actually work, I'll probably re-do my hdparm
stuff to detect use them when available, avoiding the need for libata
to snoop passthrough commands. But Jeff may (or not) want to snoop
anyway.
As a workaround for now, Ric is using the ugly hack attached here.
Cheers
With this patch, I can get the write cache to change properly, but I
still see rates that are "too fast" until I disable the queuing as
well. I think that the barriers are supposed to work with NCQ enabled,
but might there be a trace of the old "disable" barrier support if
queuing is on left somewhere?
I think the easiest way to verify basic things are working is by booting
the machine with write cache enabled.
Also, disabling the queue via setting
/sys/class/scsi_disk/4\:0\:0\:0/device/queue_depth does not seem to take
effect unless I unmount the file system & remount. I will poke around
to see if reiserfs is disabling with queuing enabled & only reenables on
a fresh mount...
I don't think you're supposed to change cache setting underneath a live FS.
--
tejun
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