On 2017-11-29 12:15 AM, Jason Wang wrote:
On 2017年11月29日 10:52, Dave Hill wrote:
Thanks. Zerocopy is disabled by several distribution by default. For
upstream, the only reason to let it on is to hope more developers
can help and fix the issues.
So I never hit this issue with previous kernel and this issue started
happening with the v4.14-rc series.
Right, this still need to be investigated if it was introduced recently.
Looking at git history, the only suspected commit is for 4.14 is
commit 1e6f74536de08b5e50cf0e37e735911c2cef7c62
Author: Willem de Bruijn <willemb@xxxxxxxxxx>
Date: Fri Oct 6 13:22:31 2017 -0400
vhost_net: do not stall on zerocopy depletion
Maybe you can try to revert it and see.
If it does not solve your issue, I suspect there's bug elsewhere that
cause a packet to be held for very long time.
I'm using rawhide so perhaps this is why it isn't disabled by
default but I have to mention it's an update of FC25 up to FC28 and
it never got disabled.
Perhaps it should be disabled in Fedora too if it's not the case...
I'm not sure this is the place to discuss this ... is it?
Probably not, but I guess Fedora tries to use new technology
aggressively.
Thanks
I can revert that commit in 4.15-rc1 but I can't find it in 4.14.2 ...
Is there another commit that could affect this ?
