Date: Mon, 31 Mar 2014 12:49:18 +0200 From: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com> To: Big Lebowski <spankthespam@gmail.com>, Mark Felder <feld@freebsd.org> Cc: freebsd-xen@freebsd.org Subject: Re: Terrible performance of XenServer 6.2 and FreeBSD 10.0-RELEASE guest Message-ID: <5339482E.9020301@citrix.com> In-Reply-To: <CAHcXP%2Bdo3xx%2BRUjtgRnCooNXnzFm5xMcPDvuwrLawZ_Gk7fc6g@mail.gmail.com> References: <CAHcXP%2BeLEKP%2BrZ5gXo_fg1Q_jQQ7-G-_E8Bn5co-FjvSV2G22Q@mail.gmail.com> <8FDB514D-1A94-48B2-AE19-62923F327938@FreeBSD.org> <CAHcXP%2Bdo3xx%2BRUjtgRnCooNXnzFm5xMcPDvuwrLawZ_Gk7fc6g@mail.gmail.com>
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On 29/03/14 14:30, Big Lebowski wrote: > This was enabled, but I've now disabled it. However, the network I/O seems > to be ok, on par with what I can achieve on Linux boxes. Its disk I/O that > makes the system unusable. I've done a `tar -Jxf src.txz` on identical boxes (which I think should generate a similar IO workload to what you are doing), one running FreeBSD natively, and the other running a FreeBSD PVHVM guest on top of Xen: Native: # time tar -Jxf src.txz real 2m15.280s user 0m10.021s sys 0m5.257s Xen guest: # time tar -Jxf src.txz real 3m13.366s user 0m11.430s sys 0m4.767s Which doesn't look that bad. When running under Xen I didn't experience any kind of noticeable slowness while running this workload on screen and switched to another console. If you think disk IO is the culprit, could you provide some synthetic workload with fio that can reproduce this? (Also the dmesg of the FreeBSD guest might be of interest) My test was done using OSS Xen 4.5 and a Linux Dom0 running kernel 3.13. Roger.
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