| f6750482 | 09-Aug-2019 |
Alexander Motin <[email protected]> |
MFC r350378: Allow WRITE SAME handle more then 2^^32 blocks.
If not limited by write_same_max_lba option, split operation into several
2^^31 blocks chunks in a loop. For large disks it may take a w
MFC r350378: Allow WRITE SAME handle more then 2^^32 blocks.
If not limited by write_same_max_lba option, split operation into several
2^^31 blocks chunks in a loop. For large disks it may take a while, so
setting write_same_max_lba may be useful to avoid timeouts.
While there, fix build with CAM_CTL_DEBUG.
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| f90b54e5 | 13-Mar-2019 |
Alexander Motin <[email protected]> |
MFC r344636: Refactor command ordering/blocking mechanism in CTL.
Replace long per-LUN queue of blocked commands, scanned on each command
completion and sometimes even twice, causing up to O(n^^2) p
MFC r344636: Refactor command ordering/blocking mechanism in CTL.
Replace long per-LUN queue of blocked commands, scanned on each command
completion and sometimes even twice, causing up to O(n^^2) processing cost,
by much shorter per-command blocked queues, scanned only when respective
command completes, and check only commands before the previous blocker,
reducing cost to O(n).
While there, unblock aborted commands to make them "complete" ASAP to be
removed from the OOA queue and so not waste time ordering other commands
against them. Aborted commands that were not sent to execution yet should
have no visible side effects, so this is safe and easy optimization now,
comparing to commands already in processing, which are a still pain.
Together those two optimizations should fix quite pathological case, when
due to backend slowness CTL accumulated many thousands of blocked requests,
partially aborted by initiator and so supposedly not even existing, but
still wasting CTL CPU time.
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| 10e146f8 | 11-Mar-2019 |
Alexander Motin <[email protected]> |
MFC r344743: Reduce CTL threads priority to about PUSER.
Since in most configurations CTL serves as network service, we found
that this change improves local system interactivity under heavy load.
P
MFC r344743: Reduce CTL threads priority to about PUSER.
Since in most configurations CTL serves as network service, we found
that this change improves local system interactivity under heavy load.
Priority of main threads is set slightly higher then worker taskqueues
to make them quickly sort incoming requests not creating bottlenecks,
while plenty of worker taskqueues should be less sensitive to latency.
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