(In reply to Mikhail Novosyolov from comment #59)
> You mean that when e.g. Chromium browser writes its cache, it loads IO "up
> to 10x higher than EXT4"
Yes. This is also true for read operations, not only for write.
> and, when IO is also loaded by swapping, it causes
> microfreezes?
Yes,
I have an idea why this bug is much worse with BTRFS than with EXT4:
BTRFS has much bigger read/write amplification, up to 10x higher than
EXT4.
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Recently, about since kernel 5.2.7, the issue is either gone or present to much
less extent.
Right now I'm running kernel 5.2.11 and finally I can keel Firefox and
VirtualBox running at the same time, with 3G+ in swap, and the system does not
freeze.
Could anyone affected by this issue try
(In reply to Luca from comment #40)
> I switched from BTRFS to EXT4 and this did seem to solve the problem, at
> least for me.
Do you use swap file or swap partition? I use swap partition, so it
shouldn't matter, but I indeed have btrfs for /.
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These lockups are probably not related to this bug. I've updated by Intel Sandy
Bridge laptop to 4.17.5 from Fedora 28 repository and now I have random CPU
lockups, too.
4.17.3 worked fine.
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