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Hangbin Liu b5f862180d bonding: discard lowest hash bit for 802.3ad layer3+4 
After commit 07f4c90062 ("tcp/dccp: try to not exhaust ip_local_port_range
in connect()"), we will try to use even ports for connect(). Then if an
application (seen clearly with iperf) opens multiple streams to the same
destination IP and port, each stream will be given an even source port.

So the bonding driver's simple xmit_hash_policy based on layer3+4 addressing
will always hash all these streams to the same interface. And the total
throughput will limited to a single slave.

Change the tcp code will impact the whole tcp behavior, only for bonding
usage. Paolo Abeni suggested fix this by changing the bonding code only,
which should be more reasonable, and less impact.

Fix this by discarding the lowest hash bit because it contains little entropy.
After the fix we can re-balance between slaves.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-08 11:28:43 +09:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2017-11-03 10:36:43 -07:00
block
certs
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Documentation Update MIPS email addresses 2017-11-03 09:02:30 -07:00
drivers bonding: discard lowest hash bit for 802.3ad layer3+4 2017-11-08 11:28:43 +09:00
firmware
fs fs/hugetlbfs/inode.c: fix hwpoison reserve accounting 2017-11-03 07:39:19 -07:00
include netfilter/ipvs: clear ipvs_property flag when SKB net namespace changed 2017-11-04 22:37:42 +09:00
init License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
ipc
kernel License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
lib License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
mm mm, swap: fix race between swap count continuation operations 2017-11-03 07:39:19 -07:00
net tcp: fix DSACK-based undo on non-duplicate ACK 2017-11-05 23:16:50 +09:00
samples License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
scripts Kbuild: don't pass "-C" to preprocessor when processing linker scripts 2017-11-02 14:10:37 -07:00
security License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
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tools License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
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