Date: Thu, 08 Jun 2017 22:13:57 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-virtualization@FreeBSD.org Subject: [Bug 219672] vmxnet3: with LRO enabled under FreeBSD 11 as a router, outgoing speed of forwarded traffic becomes slower Message-ID: <bug-219672-27103-7fHIqxgCYZ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-219672-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-219672-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219672 --- Comment #3 from Mark Peek <mp@FreeBSD.org> --- >From my testing this is not a bug and everything is working as designed. I = am seeing a large decrease in performance when LRO is turned on and using pfSe= nse as a gateway. This is due to the originating packets having the IP DF (don= =E2=80=99t fragment) flag set which then gets combined into larger packets via LRO. Wh= en this (larger) packet needs to be fragmented to match the other NIC the Free= BSD kernel sees the DF flag, drops the packet, and then sends back an ICMP =E2=80=9Cunreachable - need to frag=E2=80=9D message to the sender. The rea= son it works at all is due to other traffic which disallows the LRO to occur and some packets g= et forwarded. One test I did was turning LRO on and using scp to put a file onto the pfSe= nse appliance which resulted in good performance (not seeing the same drop in performance). I would be interested if you 1) see good performance with LRO turned on and scp a large file to the appliance and 2) see ICMP "need to fr= ag" with LRO turned on and scp to a machine on the remote side. Since the pfSense appliance is being used as a gateway you should leave LRO turned off. --=20 You are receiving this mail because: You are the assignee for the bug.=
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