Red Hat Bugzilla – Bug 154436
kernel dm-multipath: Speed up path testing by inserting test I/O at front of queue
Last modified: 2008-10-22 16:53:42 EDT
Provide a facility for the tools to insert test I/O at the front of the queue.
In the interest of reducing delay time when testing either good or
failed paths, could we (2) insert the test path i/os at the
head of the path's block i/o queue?
Currently the scsi_cmd_ioctl->sg_io->blk_execute_rq code
path for a multipath test i/o unconditionally
inserts the request at the tail of the request queue for the scsi
device representing the scsi path being tested.
Possibly the desire for this attribute could be
passed as a flag bit setting in the flag field of the sg_io_hdr
structure passed into the kernel as part of the test path ioctl(2).
[Ed Goggin, EMC]
I wish I understood the SG_IO ioctl() code path better...
Hasa any progress been made on this Bugzilla?
Nothing has happened to this bug in three years. Is it still relevant?
The information we've requested above is required in order
to review this problem report further and diagnose or fix the
issue if it is still present. Since it has been thirty days or
more since we first requested additional information, we're assuming
the problem is either no longer present in the current Fedora release, or
that there is no longer any interest in tracking the problem.
Setting status to "CLOSED: INSUFFICIENT_DATA". If you still
experience this problem after updating to our latest Fedora
release and can provide the information previously requested,
please feel free to reopen the bug report.
Thank you in advance.