[Bug 206447] New: __skb_get_hash_symmetric makes tun queue not balance

[Bug 206447] New: __skb_get_hash_symmetric makes tun queue not balance

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206447

            Bug ID: 206447
           Summary: __skb_get_hash_symmetric makes tun queue not balance
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.10.0-862.14 and later
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: glovejmm@163.com
        Regression: No

We use tun ko to creaste a vm with ovs,  We found thst tun_select_queue changed
the hash method from  skb_get_hash to __skb_get_hash_symmetric, in higher
kernel version.

What refuse us is it is quite balance in tun queue select in old version, while
it is often focus on 1-2 queues in new version with above change.

When we rollback the hash methd  to skb_get_hash with kernel recompile , 
balance recover normal again .


Is there any config or patch relation with this hash not balance problem?


here is the change patch

https://patchwork.ozlabs.org/patch/643209

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[Bug 206447] __skb_get_hash_symmetric makes tun queue not balance

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206447

--- Comment #1 from glovejmm@163.com ---
Testcase is vm1 to vm2 in different hosts, use  iperf3 tcp streams with -P 20

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