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[Xen-devel] Re: Xend transaction reduction breaks migration

  • To: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Thu, 15 Nov 2007 18:46:19 +0000
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 15 Nov 2007 10:47:16 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acgnt89FDYp0uJOrEdy0XAAX8io7RQ==
  • Thread-topic: Xend transaction reduction breaks migration

On 15/11/07 18:39, "Daniel P. Berrange" <berrange@xxxxxxxxxx> wrote:

>> Any idea how your patch could cause this rather bizarre behaviour? I haven't
>> worked it out myself, though I'm 99% sure it *is* that changeset that has
>> caused this regression (based on tests with the changeset reverted).
> Basically, instead of doing many small transactions, my change made some stuff
> all happen in one large transaction. Oddly though, I tried to be careful so
> that I only changed the codepath for the 'xm list' operation (well the SEXPR
> call to the list operation). Other operations like create, save, restore
> ought to be left using fine grained transactions as before.

I'll have another look at nearby changesets in xen-unstable then. Yours
doesn't really look all that likely to cause this problem, except that the
empirical evidence does point at it.

 -- Keir

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