** Changed in: linux (Ubuntu Disco)
Status: Triaged => Won't Fix
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https://bugs.launchpad.net/bugs/1801305
Title:
Restore request-based mode to xen-blkfront for
Upon closer inspection, it looks like we probably do want to keep the PM
patches, so I've only dropped "UBUNTU: SAUCE: xen-blkfront: resurrect
request-based mode."
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Adding a note that we must drop these patches for 5.0 (disco). The
single queue IO schedulers are gone; blk-mq is the only game in town.
For reference, this seems to be one of the key commits:
** Also affects: linux-aws (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux (Ubuntu)
** Changed in: linux-aws (Ubuntu Trusty)
Status: New => Fix Released
** Changed in: linux-aws (Ubuntu Xenial)
Status: New => Fix Released
** Changed in: linux-aws
I've checked that the proposed Xenial AWS kernel works - it boots
successfully and uses the deadline scheduler by default on a t2.micro
instance.
Regards,
Daniel
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** Changed in: linux (Ubuntu Trusty)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1801305
Title:
Restore request-based mode to xen-blkfront
** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: Fix Committed
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1801305
Title:
Restore request-based mode to xen-blkfront for AWS
** Description changed:
In current Ubuntu kernels, PV blkfront drivers have blk-mq enabled by
default and cannot use the old I/O scheduler.
[Impact]
blk-mq is not as fast as the old request-based scheduler for some workloads
on HDD disks.
[Fix]
Amazon Linux has a commit which
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