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Re: [Xen-devel] FYI: xend extremly slow when on nfsroot due to xenstored


  • To: Stefan Berger <stefanb@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Sat, 15 Sep 2007 07:51:44 +0100
  • Delivery-date: Fri, 14 Sep 2007 23:47:49 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acf3ZOCVH0/raGNYEdyNxwAWy6hiGQ==
  • Thread-topic: [Xen-devel] FYI: xend extremly slow when on nfsroot due to xenstored

Every xenstored transation creates and destroys a tdb file, causing synchronous operations to the remote NFS server. It’s no wonder it sucks, although 4 seconds is surprising!

 -- Keir

On 14/9/07 22:01, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:

A couple of those ~4 second transactions are occuring and it adds up to > 40 seconds. I still find it surprising that xenstore internally needs so much more time when running via NFSRoot. When run on ramfs the xenstore transaction all occur in less than one second.
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