Date: Thu, 04 Jul 2019 09:39:27 +0100 From: Karl Pielorz <kpielorz_lst@tdx.co.uk> To: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com>, Christian M <christian.marcos@gmail.com> Cc: 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: <A8BE57412B591EFA4671481B@[10.12.30.106]> In-Reply-To: <20190704072354.6ycduisiidz5iy2x@Air-de-Roger> 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>
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--On 04 July 2019 09:23 +0200 Roger Pau Monn=C3=A9 <roger.pau@citrix.com> = wrote: > As a workaround you can switch to the emulated network card by > setting 'hw.xen.disable_pv_nics=3D1' in /boot/loader.conf. That will > give you worse performance than a fully working PV network card, but > at least should be consistent. There are others that have switched to > virtio-net, but I have no idea how to do that with XCP. Just to add my $0.02's to the conversation... As Roger knows we've had numerous issues with Xen xn based networking and=20 FreeBSD guests over the years. We currently run VirtIO (vtnet) on XenServer = 7.1 and it solves all these issues (it's probably not quite as 'performant' = as xn - but it's close for what we're using it with - it is miles better=20 than e1000 performance). Unfortunately in XenServer 7.6 virtio is no longer compiled into Qemu from=20 what I can see. XCP-ng has the same issue (as it's based on XenServer) - so = virtio is currently not an option with XCP-ng either. e1000/rtl8139 will solve 'weirdness' (think of VM's routing traffic, doing=20 DHCP or VPN duties) - but virtio solves the same issues, with much better=20 performance. I've posted to the XCP-ng forums asking if virtio can be enabled in XCP-ng=20 builds (as this is probably more likely that getting XenServer to release=20 with it enabled). Aside from getting Xen xn 'fixed' for the cases it currently fails (no=20 small undertaking from what I understand) - it leaves FreeBSD pretty much=20 stuck, at least for some usage cases. Regards, -Karl
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