[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [OSSTEST PATCH] sg-report-flight: Use WITH OFFSET 0 for optimisation fence


  • To: Ian Jackson <Ian.Jackson@xxxxxxxxxx>
  • From: George Dunlap <George.Dunlap@xxxxxxxxxx>
  • Date: Fri, 14 Aug 2020 12:58:52 +0000
  • Accept-language: en-GB, en-US
  • Authentication-results: esa1.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none
  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 14 Aug 2020 12:59:01 +0000
  • Ironport-sdr: rWQy7Xwl9wyGpZc0orNtUlYnrzqLiRTjXbqKOP3M1Kqu/eRVBlOM42YPSeSkPIn0H0RjXwMF7x 1TIZ11w6LgY0DofCe7tNCuH1KBDYCHQPrhNqf5Z/DlLxx5QUfMvJnTwHjR8MvdtYsijvodg4jT patf2FETODDvdoa3/hPaY6eYx/hYAjFwfZHs+ZCiFQTzq90eTyJJwQvFZTMEf8LzXZOpJp/Q5k MQpFe5Um4SZAHMvTrthMbi5tm2baFdyx4zWVLMPguIYeVK8ywZM1+pw3940Gf3v6cqXSo9zzok 1p4=
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Thread-index: AQHWci+HBhZqt2GTOkiXU/Pm77PGl6k3b2sA
  • Thread-topic: [OSSTEST PATCH] sg-report-flight: Use WITH OFFSET 0 for optimisation fence


> On Aug 14, 2020, at 12:39 PM, Ian Jackson <ian.jackson@xxxxxxxxxxxxx> wrote:
> 
> I am not best pleased.
> 
> CC: George Dunlap <George.Dunlap@xxxxxxxxxx>
> Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>

It is too bad they’re not backporting the “turn off the optimization that 
breaks everyone’s queries” feature.  

I was going to say that `OFFSET 0` might be pretty stable; but upon reflection, 
passing in a zero offset to a query probably isn’t actually that rare (e.g., 
the first page of search results).  It actually is the kind of thing someone 
might come along and decide to optimize, taking a way yet another fence 
everyone was using.

Anyway, what can you do.

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.