Date: Tue, 25 Jun 2019 10:21:03 +0200 From: Roger Pau =?utf-8?B?TW9ubsOp?= <roger.pau@citrix.com> To: Christian M <christian.marcos@gmail.com> Cc: <freebsd-xen@freebsd.org> Subject: Re: Very slow and inconsistent internal network speed (between, VM's on the same host) for FreeBSD 11.0+ as guest on, XCP-ng/XenServer Message-ID: <20190625082103.qiiz2cikrauaqlas@MacBook-Air-de-Roger.local> In-Reply-To: <CAKwR994kQTRfB0R0_WiTYx4pgOHtR-ge7h0vP8NiM_%2B-MBPGGw@mail.gmail.com> References: <mailman.7.1560945600.15387.freebsd-xen@freebsd.org> <12994df1-f847-ec92-aae8-43a32e59385f@darco.dk> <CAKwR994kQTRfB0R0_WiTYx4pgOHtR-ge7h0vP8NiM_%2B-MBPGGw@mail.gmail.com>
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On Mon, Jun 24, 2019 at 10:24:09PM +0200, Christian M wrote: > Thanks for your input Bjarne. > > Previously I tested with iperf2, but I have made som tests with iperf3 now > also and noticed there are a lot of "Retr" (TCP retries) in some cases. > Went back here to your post and saw that your results also showed a lot of > retries in some cases. My new tests showed similar results to yours > (although not nearly as hi throughput as you have). When Linux is client > the retries are 0, with FreeBSD as client the number is > 0. Can you figure out what caused those retries? Wrong MTU, bad checksums? > I'm not sure > if our numbers are considered high though, and something that actually is a > problem? Although, on a internal network with no external factors like > interference, I feel this should always be 0 no matter what? If properly configured yes, there should be no retries when doing intra-VM connections. Thanks, Roger.
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