** Tags added: cscc
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https://bugs.launchpad.net/bugs/1806488
Title:
Support non-strict iommu mode on arm64
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This bug was fixed in the package linux - 4.19.0-12.13
---
linux (4.19.0-12.13) disco; urgency=medium
* linux: 4.19.0-12.13 -proposed tracker (LP: #1813664)
* kernel oops in bcache module (LP: #1793901)
- SAUCE: bcache: never writeback a discard operation
* Disco update: 4
This bug was fixed in the package linux - 4.18.0-14.15
---
linux (4.18.0-14.15) cosmic; urgency=medium
* linux: 4.18.0-14.15 -proposed tracker (LP: #1811406)
* CPU hard lockup with rigorous writes to NVMe drive (LP: #1810998)
- blk-wbt: Avoid lock contention and thundering he
This bug was fixed in the package linux - 4.15.0-44.47
---
linux (4.15.0-44.47) bionic; urgency=medium
* linux: 4.15.0-44.47 -proposed tracker (LP: #1811419)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
* CPU hard lockup with rigorous writes to NVM
Performance on NVMe has increased a lot.
-update kernel
Run status group 0 (all jobs):
READ: bw=1358MiB/s (1424MB/s), 1358MiB/s-1358MiB/s (1424MB/s-1424MB/s),
io=133GiB (142GB), run=19-19msec
-proposed kernel
Run status group 0 (all jobs):
READ: bw=1406MiB/s (1475MB/s), 1406MiB/s-1
** Description changed:
[Impact]
The Intel IOMMU driver provides an option for strict mode. When disabled,
batching of IOTLB flush operations is permitted, allowing the user to trade-off
isolation for improved performance. Ubuntu's kernel currently lacks a parity
for this feature for ARM.
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-
cosmic' to 'verification-done-cosmic'. If the problem still exists,
change the tag 'verifica
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-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verifica
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1806488
Title:
Support non-strict iommu mode on arm64
To manage notifi
** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Fix Committed
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1806488
Title:
Support non-strict iommu mode on arm64
To manage notifi
** Changed in: linux (Ubuntu Disco)
Status: In Progress => Fix Committed
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1806488
Title:
Support non-strict iommu mode on arm64
To manage notific
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1806488
Title:
Support non-strict iommu mode on arm64
To manage notifications ab
** Changed in: linux (Ubuntu Cosmic)
Status: New => In Progress
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1806488
Title:
Support non-strict iommu mode on arm64
To manage notifications ab
** Description changed:
[Impact]
- There's a significant performance gain to be had by removing the need to
flush the IOMMU TLB on every unmap. I'm seeing a 25% performance gain w/ fio
reads on a single NVMe device. This mode of operation is available for x86 via
the "intel_iommu=strict" para
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** C
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