Date: Thu, 13 Feb 2020 18:58:53 -0800 From: Brian Buhrow <buhrow@nfbcal.org> To: freebsd-xen@freebsd.org Subject: Slow networking speeds with Freebsd 12.0 and Xen-4.12.1, freebsd-12.0 as dom0 Message-ID: <202002140258.01E2wrpj018654@lothlorien.nfbcal.org>
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Hello. I'm noticing that network performance on guest VN's whether they're pv or hvm is very slow when using FreeBSD-12.0 as dom0 as compared with older versions of Xen and NetBSD as dom0. For example, I have the following two comparisons, both with the same domu running: FreeBSD-12.0/Xen 4.12.1, 60 mbits/sec from the vm in question. NetBSD-5.2/xen 3.3, 781 mbits/sec with the same vm as above. The NetBSD installation is running single CPU for the dom0, with 4GB of RAM, as opposed to FreeBSD, which is running 8GB of RAM and 4 CPU's. By contrast, disk performance under FreeBSD using zfs zvols' as virtual disks is quite fast. As a work around, I tried turning on msi interrupt handling on dom0 on FreeBSD, using msi=false on the xen command line at boot time, but that only resulted in a panic from FreeBSD because it couldn't get enough disk interrupts to mount the root filesystem. Has anyone else noticed this abysmal network performance with FreeBSD-12 as dom0? If so, has anyone come up with fixes? -thanks -Brian
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