hisi_sas performance improvements

[dann frazier]

[Impact]
Recent changes to the upstream driver improve write performance scalability with large numbers of disks.

[Test Case]
Attach SSDs to the controller, and run fio with the attached configuration file (adjust disk names as appropriate). You should see a nearly 2x improvement.

[Regression Risk]
The fixes are localized to the hisi_sas driver.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.12.0-11.12

---------------
linux (4.12.0-11.12) artful; urgency=low

  * linux: 4.12.0-11.12 -proposed tracker (LP: #1709929)

  * CVE-2017-1000111
    - packet: fix tp_reserve race in packet_set_ring

  * CVE-2017-1000112
    - udp: consistently apply ufo or fragmentation

  * Please only recommend or suggest initramfs-tools | linux-initramfs-tool for
    kernels able to boot without initramfs (LP: #1700972)
    - Revert "UBUNTU: [Debian] Don't depend on initramfs-tools"
    - [Debian] Don't depend on initramfs-tools

  * Miscellaneous Ubuntu changes
    - SAUCE: (noup) Update spl to 0.6.5.11-ubuntu1, zfs to 0.6.5.11-1ubuntu3
    - SAUCE: powerpc: Always initialize input array when calling epapr_hypercall()

  * Miscellaneous upstream changes
    - selftests: typo correction for memory-hotplug test
    - selftests: check hot-pluggagble memory for memory-hotplug test
    - selftests: check percentage range for memory-hotplug test
    - selftests: add missing test name in memory-hotplug test
    - selftests: fix memory-hotplug test

 -- Seth Forshee <email address hidden> Thu, 10 Aug 2017 13:37:00 -0500

[Kleber Sacilotto de Souza (kleber-souza)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-zesty' to 'verification-done-zesty'. If the problem still exists, change the tag 'verification-needed-zesty' to 'verification-failed-zesty'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[dann frazier (dannf)]

For a 1 disk setup, I'm seeing a tiny - possibly insignificant - improvement. There's no obvious regression, so I'll go ahead and mark verified.

dannf@d05-3:~$ tail -n2 fio.out.*
==> fio.out.new <==
Disk stats (read/write):
  sda: ios=45/80729, merge=0/4929748, ticks=856/3320144, in_queue=3321592, util=100.00%

==> fio.out.old <==
Disk stats (read/write):
  sda: ios=0/80887, merge=0/4933228, ticks=0/3324968, in_queue=3325680, util=99.93%

I've requested some testing w/ a larger array to confirm the scaling improvements.

[dann frazier (dannf)]

Note: in the above:
  old = 4.10.0-32.36
  new = 4.10.0-33.37

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.10.0-33.37

---------------
linux (4.10.0-33.37) zesty; urgency=low

  * linux: 4.10.0-33.37 -proposed tracker (LP: #1709303)

  * CVE-2017-1000112
    - Revert "udp: consistently apply ufo or fragmentation"
    - udp: consistently apply ufo or fragmentation

  * CVE-2017-1000111
    - Revert "net-packet: fix race in packet_set_ring on PACKET_RESERVE"
    - packet: fix tp_reserve race in packet_set_ring

  * ThunderX: soft lockup on 4.8+ kernels when running qemu-efi with vhost=on
    (LP: #1673564)
    - irqchip/gic-v3: Add missing system register definitions
    - arm64: KVM: Do not use stack-protector to compile EL2 code
    - KVM: arm/arm64: vgic-v3: Use PREbits to infer the number of ICH_APxRn_EL2
      registers
    - KVM: arm/arm64: vgic-v3: Fix nr_pre_bits bitfield extraction
    - arm64: Add a facility to turn an ESR syndrome into a sysreg encoding
    - KVM: arm/arm64: vgic-v3: Add accessors for the ICH_APxRn_EL2 registers
    - KVM: arm64: Make kvm_condition_valid32() accessible from EL2
    - KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2
    - KVM: arm64: vgic-v3: Add ICV_BPR1_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_IGRPEN1_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_IAR1_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_EOIR1_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_AP1Rn_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_HPPIR1_EL1 handler
    - KVM: arm64: vgic-v3: Enable trapping of Group-1 system registers
    - KVM: arm64: Enable GICv3 Group-1 sysreg trapping via command-line
    - KVM: arm64: vgic-v3: Add ICV_BPR0_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_IGNREN0_EL1 handler
    - KVM: arm64: vgic-v3: Add misc Group-0 handlers
    - KVM: arm64: vgic-v3: Enable trapping of Group-0 system registers
    - KVM: arm64: Enable GICv3 Group-0 sysreg trapping via command-line
    - arm64: Add MIDR values for Cavium cn83XX SoCs
    - [Config] CONFIG_CAVIUM_ERRATUM_30115=y
    - arm64: Add workaround for Cavium Thunder erratum 30115
    - KVM: arm64: vgic-v3: Add ICV_DIR_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_RPR_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_CTLR_EL1 handler
    - KVM: arm64: vgic-v3: Add ICV_PMR_EL1 handler
    - KVM: arm64: Enable GICv3 common sysreg trapping via command-line
    - KVM: arm64: vgic-v3: Log which GICv3 system registers are trapped
    - arm64: KVM: Make unexpected reads from WO registers inject an undef
    - KVM: arm64: Log an error if trapping a read-from-write-only GICv3 access
    - KVM: arm64: Log an error if trapping a write-to-read-only GICv3 access

  * ibmvscsis: Do not send aborted task response (LP: #1689365)
    - target: Fix unknown fabric callback queue-full errors
    - ibmvscsis: Do not send aborted task response
    - ibmvscsis: Clear left-over abort_cmd pointers
    - ibmvscsis: Fix the incorrect req_lim_delta

  * hisi_sas performance improvements (LP: #1708734)
    - scsi: hisi_sas: define hisi_sas_device.device_id as int
    - scsi: hisi_sas: optimise the usage of hisi_hba.lock
    - scsi: hisi_sas: relocate sata_done_v2_hw()
    - scsi: hisi_sas: optimise DMA slot memory

  * hisi_sas...