Date: Fri, 18 Feb 2011 15:40:35 +0000 From: Hugo Silva <hugo@barafranca.com> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-xen@freebsd.org Subject: Re: XenServer? Message-ID: <4D5E92F3.6050709@barafranca.com> In-Reply-To: <AANLkTin5tUG2EWB0CrD2cWqbH_8XVyjJeh2huijuj01k@mail.gmail.com> References: <AANLkTiktYkyrJ9Kzo7E9EAMBC9n9JzAD5-spYAzUnQnX@mail.gmail.com> <4D5E7CF7.8020209@barafranca.com> <AANLkTin5tUG2EWB0CrD2cWqbH_8XVyjJeh2huijuj01k@mail.gmail.com>
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Ivan Voras wrote: > On 18 February 2011 15:06, Hugo Silva <hugo@barafranca.com> wrote: > >> Performance seems to be acceptable. There's a gotcha with PF, which someone >> else mentioned in this list recently. One has to disable tcp.tso to get >> decent throughput. >> >> Disabling it enabled a colleague who is currently in Africa to go from >> stalled..2KB/s sftp connections to 70KB/s. > > I hope that 70 kB/s is due to him being in Africa and not Xen+FreeBSD > performance :) I'm thinking of using this on a moderately loaded web > server (cca 5 GB/day traffic). Definitely - I can upload files (via sftp) to this VM at ~90% my home connection upstream, over a UDP VPN. Also, a few weeks ago while setting this up, on local LAN tests it managed to push 400-600mbit/s (iperf) without a lot of tuning. Back when I ran the iperf test PF wasn't enabled yet, so that might explain how it managed to get to that (altough I haven't tested the other poster's assertion that the performance problem only manifests with PF on) In my experience NetBSD tends to perform better under Xen but that could be because HVM+PV vs PV. Also a NetBSD PV domU is limited to a single CPU, while with FreeBSD HVM+PV you can use many vcpus. I haven't tested with high vcpu counts, but in this particular VM, it's been running happily with 2 VCPUs and no noticeable problems. No panics, no noticeable performance problems (after the tso fix) and certainly not the famous 'time went backwards' problem.
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