This seems to be in the kernel datapath and maybe recent issue
Greg, do you want to take a look ?


On 8/27/18, 9:50 AM, "[email protected] on behalf of Darrell 
Ball" <[email protected] on behalf of [email protected]> wrote:

    I can take a look.
    
    On 8/27/18, 9:47 AM, "[email protected] on behalf of Ben 
Pfaff" <[email protected] on behalf of [email protected]> wrote:
    
        On Mon, Aug 27, 2018 at 01:20:15PM +0000, Zhang, Jing C. (Nokia - 
CA/Ottawa) wrote:
        > We have customers reporting sluggish HTTP download with OVS 2.9.0. 
After debugging, we find the issue is OVS 2.9.0 native firewall drops TCP 
control packets (TCP ACK) with empty payload. The issue can be avoided by 
either reverting back to the legacy Linux bridge firewall or enabling TCP 
timestamp at both HTTP server and client sides.
        > $ ovs-vswitchd --version
        > ovs-vswitchd (Open vSwitch) 2.9.0
        > DPDK 17.11.0
        
        Darrell, this seems like it's in your area.  Will you take a look?
        
        Thanks,
        
        Ben.
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