Date: Thu, 04 Jul 2019 11:00:56 +0100 From: Karl Pielorz <kpielorz_lst@tdx.co.uk> To: Christian M <christian.marcos@gmail.com> Cc: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com>, freebsd-xen@freebsd.org, Eugene Grosbein <eugen@grosbein.net>, freebsd-net@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: <9BAF7DF10B3842D6ADEE168D@[10.12.30.106]> In-Reply-To: <CAKwR995TYN4aa%2B7XXFxMe5Grw15nA6VR5f%2BFQVh%2BwLfVg4_BFA@mail.gmail.com> References: <d89b2b9a-5005-c9ee-5364-9affff5fd1f5@grosbein.net> <CAKwR995FNv-QjkUQKaHw7Wb2jhA3DoiWzQ7prnA-k56qE8vifw@mail.gmail.com> <9c377fe7-5546-9e0b-fac9-076dd094cbac@grosbein.net> <CAKwR996i6ZJLt4iBFTedDNzPaO2mFt5jz3P6iFM-Y1SJ0pu_wA@mail.gmail.com> <ce1f2ebb-c0bf-73c5-f857-be6b24e71da1@grosbein.net> <CAKwR997Zjxkpr48DJ08csLobLK5u5bBY%2BKrQ8r22hdZYJUNREA@mail.gmail.com> <47bb1bfe-ac39-78d3-c9b9-17ff1896e0ec@grosbein.net> <CAKwR9968gf1RkgP7hD8XOh4Z-Ti917P6W5Lt3-Lakx6r9pei9g@mail.gmail.com> <20190627101901.3szaaxhp4xzjiay5@MacBook-Air-de-Roger.local> <CAKwR994OYS2Hjhu=QdR2DSoZVyDWEky2Nkmu_LWDQRJiggqxmA@mail.gmail.com> <20190704072354.6ycduisiidz5iy2x@Air-de-Roger> <A8BE57412B591EFA4671481B@10.12.30.106> <CAKwR995TYN4aa%2B7XXFxMe5Grw15nA6VR5f%2BFQVh%2BwLfVg4_BFA@mail.gmail.com>
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--On 04 July 2019 10:59 +0200 Christian M <christian.marcos@gmail.com> wrote: > From my tests I found that 10.4-RELEASE was as fast as you could expect > (>10Gbit/s), then something changed in 11.0-RELEASE and carried on and got > even worse in 12.0-RELEASE. Would it not be a good idea to begin there > (10.4 -> 11.0), and try to identify what changes could impact the > performance drop so significantly? This is perhaps a much harder task than > it sounds for someone that knows nothing about what changes was made, and > how difficult it would be to identify what changes actually could be > relevant. Just a thought. Looking at FreeBSD source - there doesn't appear to be a lot that has changed (at least in sys/xen) even from 10.4 through to 12 - certainly nothing networking I can see (unless I'm using svn log 'wrong', or there's other xen stuff within FreeBSD I should be looking at). So this could be caused by other changes that have happened with the OS over that time. If I get time - I'll see if I can follow the thread and setup a similar test system here, to be fair we've not had a performance issue with Xen Networking (as nothing we do needs the performance - yet). We've been much more plagued by packet weirdness which virtio has fixed. Even if I can re-create things here - it may only be an "oh yeah, so it is" moment. -Kp
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