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 wh
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 lon
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 3
** Tags added: verification-done-bionic
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1900438
Title:
Bcache bypasse writeback on caching device with fragmentation
Status in linux packa
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 cache_available_
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Assignee: dongdong tao (taodd)
Status: Confirmed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1900438
Title
** Changed in: linux (Ubuntu Bionic)
Importance: Medium => High
** Changed in: linux (Ubuntu Focal)
Importance: Medium => High
** Changed in: linux (Ubuntu Groovy)
Importance: Medium => High
--
You received this bug notification because you are a member of Kernel
Packages, which is sub
Here is the latest updated patch and the progress being made in upstream
https://marc.info/?l=linux-bcache&m=160981605206306&w=1
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1900438
Tit
so affects: linux (Ubuntu 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 Fo
9 matches
Mail list logo
