Revert "ALSA: HACK: Fix rmmod crash" #544
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This reverts commit a29b55c. "ALSA: HACK: Fix rmmod crash" Revert this hack. Not sure what it was intended for originally. Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
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Oct 26, 2020
[ Upstream commit f0a5e4d ] YangYuxi is reporting that connection reuse is causing one-second delay when SYN hits existing connection in TIME_WAIT state. Such delay was added to give time to expire both the IPVS connection and the corresponding conntrack. This was considered a rare case at that time but it is causing problem for some environments such as Kubernetes. As nf_conntrack_tcp_packet() can decide to release the conntrack in TIME_WAIT state and to replace it with a fresh NEW conntrack, we can use this to allow rescheduling just by tuning our check: if the conntrack is confirmed we can not schedule it to different real server and the one-second delay still applies but if new conntrack was created, we are free to select new real server without any delays. YangYuxi lists some of the problem reports: - One second connection delay in masquerading mode: https://marc.info/?t=151683118100004&r=1&w=2 - IPVS low throughput #70747 kubernetes/kubernetes#70747 - Apache Bench can fill up ipvs service proxy in seconds thesofproject#544 cloudnativelabs/kube-router#544 - Additional 1s latency in `host -> service IP -> pod` kubernetes/kubernetes#90854 Fixes: f719e37 ("ipvs: drop first packet to redirect conntrack") Co-developed-by: YangYuxi <yx.atom1@gmail.com> Signed-off-by: YangYuxi <yx.atom1@gmail.com> Signed-off-by: Julian Anastasov <ja@ssi.bg> Reviewed-by: Simon Horman <horms@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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This reverts commit a29b55c.
"ALSA: HACK: Fix rmmod crash"
Revert this hack. Not sure what it was intended for originally.