Date: Sun, 25 Oct 2015 20:37:37 +0100 From: Kristof Provost <kp@FreeBSD.org> To: James Lodge <James@Lodge.me.uk> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Jail - PF - NAT - Network Performance Message-ID: <BB154E57-A6B2-49D7-9EEA-8AEAE1134C75@FreeBSD.org> In-Reply-To: <VI1PR06MB10378E0DC73518F6A4571531F9240@VI1PR06MB1037.eurprd06.prod.outlook.com> References: <VI1PR06MB1037187D07A9C500B3E4E791F9240@VI1PR06MB1037.eurprd06.prod.outlook.com> <DF61454E-408E-432F-8822-39353632CA90@FreeBSD.org> <VI1PR06MB10378E0DC73518F6A4571531F9240@VI1PR06MB1037.eurprd06.prod.outlook.com>
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> On 25 Oct 2015, at 18:47, James Lodge <James@Lodge.me.uk> wrote: > >> On 25 Oct 2015, at 17:46, James Lodge <James@Lodge.me.uk> wrote: >> I currently have a FreeBSD 10.1 host running on Digital Ocean. I have multiple jails and I'm not using vimage. >> >> >> I'm using PF on the host to NAT traffic from said jails and all is working as expected. I have a jail running OpenVPN and clients can connect and traffic is routed to the Internet down the tunnel via PF/NAT. The issue I'm seeing is download speeds to the client from the Internet on the external side on PF. Upload always seem reasonable, but download is always woeful. I'm using a Windows machine as the client if that make any odds. >> >> Yeah, there’s an issue with checksums and pf/Xen. >> Disabling TSO should work for you (sudo sysctl net.inet.tcp.tso=0), and the problem should be completely fixed in the >next release (10.3 or 11.0) >> >> Regards, >> Kristof > > > Thanks Kristof for the quick reply, > > I was hoping it would be that simple, but Digital Ocean use KVM (from what I know) as their hypervisor so disabling TSO and LRO seems to have no noticed increase in performance. > Can you run a tcpdump while you’re seeing the problem? The issue I know about is related to the TCP checksum, so I’d expect to see many invalid checksums. Regards, Kristof
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