I used the same steps to verify it and can confirm it's succeeded in
bionic-proposed too
fio --name=test1 --filename /dev/bcache0 --direct 1 --rw=randrw
--bs=32k,4k --ioengine=libaio --iodepth=1
Then I monitoring the cache_available_percent and writeback rate.
I no longer see the
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1900438
Title:
Bcache bypasse writeback on caching device with fragmentation
Status in linux
I used the same steps to verify it and can conconfirm it's succeeded
fio --name=test1 --filename /dev/bcache0 --direct 1 --rw=randrw
--bs=32k,4k --ioengine=libaio --iodepth=1
Then I monitoring the cache_available_percent and writeback rate.
I no longer see the cache_available_percent dropped to
I've done the verification of the focal-proposed kernel.
I used below fio command to cause the bcache fragmentation:
fio --name=test1 --filename /dev/bcache0 --direct 1 --rw=randrw
--bs=32k,4k --ioengine=libaio --iodepth=1
Then I monitoring the cache_available_percent and writeback rate.
I no
** Changed in: linux (Ubuntu Bionic)
Importance: Medium => High
** Changed in: linux (Ubuntu Focal)
Importance: Medium => High
** Changed in: linux (Ubuntu Groovy)
Importance: Medium => High
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** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Assignee: dongdong tao (taodd)
Status: Confirmed
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Title
Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => dongdong tao (taodd)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => dongdong tao (taodd)
** Changed in: linux (Ubuntu Focal)
Assignee: (unas
Here is the latest updated patch and the progress being made in upstream
https://marc.info/?l=linux-bcache=160981605206306=1
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Title:
I've just submitted a patch[1] to upstream for review to help with this problem.
The key is to speed up the writeback rate when the fragmentation is high.
Here are the comments from the patch:
Current way to calculate the writeback rate only considered the
dirty sectors, this usually works fine
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