Date: Sun, 14 Feb 2016 12:55:11 +0000 From: Avi Cohen <avi.cohen@huawei.com> To: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Paravirtualized KVM clock Message-ID: <B84047ECBD981D4B93EAE5A6245AA361993A3C@lhreml501-mbb>
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Hello My name is Avi Cohen and I work in toganetworks which is part of Huawei ERC= . 1. My VM is Fedora 21 and the host is Fedora 22 (kernels are 4.1 and= 4.2 accordingly) 2. My Intel core processor supports the constant-tsc. 3. The default clock in the guest is kvm-clock . When I run a test to measure packet delay between the host and the VM (wh= ich normally should be about 5 to 10 micro-sec) - I see about 800 mili-s= ec delay I see that delta time between the VM and host is about 800ms - which means= that the sync. Accuracy is bad What accuracy do I have to expect with this clocking mode (kvm-clock) ? te= ns of ms/us/ns? Maybe I've missed some configuration to achieve a better accuracy ? Thanks and Regards, Avi
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