Re: Packet gets stuck in NOLOCK pfifo_fast qdisc

On Sat, Apr 3, 2021 at 5:23 AM Jiri Kosina [off-list ref] wrote:

I am still planning to have Yunsheng Lin's (CCing) fix [1] tested in the
coming days. If it works, then we can consider proceeding with it,
otherwise I am all for reverting the whole NOLOCK stuff.

[1] https://lore.kernel.org/linux-can/1616641991-14847-1-git-send-email-linyunsheng@huawei.com/T/#u (local)

I personally prefer to just revert that bit, as it brings more troubles
than gains. Even with Yunsheng's patch, there are still some issues.
Essentially, I think the core qdisc scheduling code is not ready for
lockless, just look at those NOLOCK checks in sch_generic.c. :-/

Thanks.