#
288802 |
|
05-Oct-2015 |
mav |
MFC r288224: Constify ctl_serialize_table.
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#
286930 |
|
19-Aug-2015 |
mav |
MFC r286345: Relax serialization of SYNCHRONIZE CACHE commands.
Before this change SYNCHRONIZE CACHE commands were executed exclusively, as if they had ORDERED tag. But looking through SCSI specs I've found no any reason to be so strict. For reads this ordering seems pointless. For writes it looks less obvious, so I left ordering against preceeding write commands, while following ones are no longer required to wait.
|
#
275895 |
|
18-Dec-2014 |
mav |
MFC r275568: Count consecutive read requests as blocking in CTL for files and ZVOLs.
Technically read requests can be executed in any order or simultaneously since they are not changing any data. But ZFS prefetcher goes crasy when it receives consecutive requests from different threads. Since prefetcher works on level of separate blocks, instead of two consecutive 128K requests it may receive 32 8K requests in mixed order.
This patch is more workaround then a real fix, and it does not fix all of prefetcher problems, but it improves sequential read speed by 3-4x times in some configurations. On the other side it may hurt performance if some backing store has no prefetch, that is why it is disabled by default for raw devices.
|
#
272630 |
|
06-Oct-2014 |
mav |
MFC r271507: Implement control over command reordering via options and control mode page.
It allows to bypass range checks between UNMAP and READ/WRITE commands, which may introduce additional delays while waiting for UNMAP parameters. READ and WRITE commands are always processed in safe order since their range checks are almost free.
|
#
272626 |
|
06-Oct-2014 |
mav |
MFC r271503: Implement range checks between UNMAP and READ/WRITE commands.
Before this change UNMAP completely blocked other I/Os while running. Now it blocks only colliding ones, slowing down others only due to ZFS locks collisions.
Sponsored by: iXsystems, Inc.
|
#
270106 |
|
17-Aug-2014 |
mav |
MFC r269497: Add support for Windows dialect of EXTENDED COPY command, aka Microsoft ODX.
This allows to avoid extra network traffic when copying files on NTFS iSCSI disks within one storage host by drag'n'dropping them in Windows Explorer of Windows 8/2012. It should also accelerate Hyper-V VM operations, etc.
|
#
269296 |
|
30-Jul-2014 |
mav |
MFC r268767: Add support for VMWare dialect of EXTENDED COPY command, aka VAAI Clone.
This allows to clone VMs and move them between LUNs inside one storage host without generating extra network traffic to the initiator and back, and without being limited by network bandwidth.
LUNs participating in copy operation should have UNIQUE NAA or EUI IDs set. For LUNs without these IDs VMWare will use traditional copy operations.
Beware: the above LUN IDs explicitly set to values non-unique from the VM cluster point of view may cause data corruption if wrong LUN is addressed!
Sponsored by: iXsystems, Inc.
|
#
269295 |
|
30-Jul-2014 |
mav |
MFC r268581: Merge several equal serialization indexes.
|
#
265634 |
|
08-May-2014 |
mav |
MFC r264274, r264279, r264283, r264296, r264297: Add support for SCSI UNMAP commands to CTL.
This patch adds support for three new SCSI commands: UNMAP, WRITE SAME(10) and WRITE SAME(16). WRITE SAME commands support both normal write mode and UNMAP flag. To properly report UNMAP capabilities this patch also adds support for reporting two new VPD pages: Block limits and Logical Block Provisioning.
UNMAP support can be enabled per-LUN by adding "-o unmap=on" to `ctladm create` command line or "option unmap on" to lun sections of /etc/ctl.conf.
At this moment UNMAP supported for ramdisks and device-backed block LUNs. It was tested to work great with ZFS ZVOLs. For file-backed LUNs UNMAP support is unfortunately missing due to absence of respective VFS KPI.
Sponsored by: iXsystems, Inc
|
#
286930 |
|
19-Aug-2015 |
mav |
MFC r286345: Relax serialization of SYNCHRONIZE CACHE commands.
Before this change SYNCHRONIZE CACHE commands were executed exclusively, as if they had ORDERED tag. But looking through SCSI specs I've found no any reason to be so strict. For reads this ordering seems pointless. For writes it looks less obvious, so I left ordering against preceeding write commands, while following ones are no longer required to wait.
|
#
275895 |
|
18-Dec-2014 |
mav |
MFC r275568: Count consecutive read requests as blocking in CTL for files and ZVOLs.
Technically read requests can be executed in any order or simultaneously since they are not changing any data. But ZFS prefetcher goes crasy when it receives consecutive requests from different threads. Since prefetcher works on level of separate blocks, instead of two consecutive 128K requests it may receive 32 8K requests in mixed order.
This patch is more workaround then a real fix, and it does not fix all of prefetcher problems, but it improves sequential read speed by 3-4x times in some configurations. On the other side it may hurt performance if some backing store has no prefetch, that is why it is disabled by default for raw devices.
|
#
272630 |
|
06-Oct-2014 |
mav |
MFC r271507: Implement control over command reordering via options and control mode page.
It allows to bypass range checks between UNMAP and READ/WRITE commands, which may introduce additional delays while waiting for UNMAP parameters. READ and WRITE commands are always processed in safe order since their range checks are almost free.
|
#
272626 |
|
06-Oct-2014 |
mav |
MFC r271503: Implement range checks between UNMAP and READ/WRITE commands.
Before this change UNMAP completely blocked other I/Os while running. Now it blocks only colliding ones, slowing down others only due to ZFS locks collisions.
Sponsored by: iXsystems, Inc.
|
#
270106 |
|
17-Aug-2014 |
mav |
MFC r269497: Add support for Windows dialect of EXTENDED COPY command, aka Microsoft ODX.
This allows to avoid extra network traffic when copying files on NTFS iSCSI disks within one storage host by drag'n'dropping them in Windows Explorer of Windows 8/2012. It should also accelerate Hyper-V VM operations, etc.
|
#
269296 |
|
30-Jul-2014 |
mav |
MFC r268767: Add support for VMWare dialect of EXTENDED COPY command, aka VAAI Clone.
This allows to clone VMs and move them between LUNs inside one storage host without generating extra network traffic to the initiator and back, and without being limited by network bandwidth.
LUNs participating in copy operation should have UNIQUE NAA or EUI IDs set. For LUNs without these IDs VMWare will use traditional copy operations.
Beware: the above LUN IDs explicitly set to values non-unique from the VM cluster point of view may cause data corruption if wrong LUN is addressed!
Sponsored by: iXsystems, Inc.
|
#
269295 |
|
30-Jul-2014 |
mav |
MFC r268581: Merge several equal serialization indexes.
|
#
265634 |
|
08-May-2014 |
mav |
MFC r264274, r264279, r264283, r264296, r264297: Add support for SCSI UNMAP commands to CTL.
This patch adds support for three new SCSI commands: UNMAP, WRITE SAME(10) and WRITE SAME(16). WRITE SAME commands support both normal write mode and UNMAP flag. To properly report UNMAP capabilities this patch also adds support for reporting two new VPD pages: Block limits and Logical Block Provisioning.
UNMAP support can be enabled per-LUN by adding "-o unmap=on" to `ctladm create` command line or "option unmap on" to lun sections of /etc/ctl.conf.
At this moment UNMAP supported for ramdisks and device-backed block LUNs. It was tested to work great with ZFS ZVOLs. For file-backed LUNs UNMAP support is unfortunately missing due to absence of respective VFS KPI.
Sponsored by: iXsystems, Inc
|