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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Jay wrote:<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>>><o:p> </o:p></p><p class=MsoPlainText>FYI, some folks have done some performance testing of Glance with<o:p></o:p></p><p class=MsoPlainText>Swift backends. It was determined that using SSL caused a dramatic<o:p></o:p></p><p class=MsoPlainText>performance degradation (roughly decreased the network I/O throughput<o:p></o:p></p><p class=MsoPlainText>by half, with a queuing behvaiour showing up on GET requests as well.)<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The solution was to disable zlib compression in SSL on the Glance API<o:p></o:p></p><p class=MsoPlainText>server box.<o:p></o:p></p><p class=MsoPlainText><<<o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Our initial tests used an image dervied from /dev/urandom which was an absolute worst case for compression.<br><br><o:p></o:p></p><p class=MsoPlainText>We found subsequently that using ZLIB with real images did provide “some” benefit (up to ~30 – but depends on image content). We also tried using LZO which gave up to 400% with a stock Ubuntu image (1.45GB). We will publish something on this when we have a more complete picture.<br><br>As Jay points out – replacing the compression algorithm is not easy.<br><br><br>Tim<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>-----Original Message-----<br>From: openstack-bounces+tim.reddin=hp.com@lists.launchpad.net [mailto:openstack-bounces+tim.reddin=hp.com@lists.launchpad.net] On Behalf Of Jay Pipes<br>Sent: 19 September 2011 16:39<br>To: Kuo Hugo<br>Cc: openstack@lists.launchpad.net<br>Subject: Re: [Openstack] Load Balancers for Swift Proxy-servers ----why Pound ?<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>On Mon, Sep 19, 2011 at 7:47 AM, Kuo Hugo <tonytkdk@gmail.com> wrote:<o:p></o:p></p><p class=MsoPlainText>> btw , most of articles just using HTTP instead of HTTPS. Does Pound better<o:p></o:p></p><p class=MsoPlainText>> than Nginx under HTTPS?<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>FYI, some folks have done some performance testing of Glance with<o:p></o:p></p><p class=MsoPlainText>Swift backends. It was determined that using SSL caused a dramatic<o:p></o:p></p><p class=MsoPlainText>performance degradation (roughly decreased the network I/O throughput<o:p></o:p></p><p class=MsoPlainText>by half, with a queuing behvaiour showing up on GET requests as well.)<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The solution was to disable zlib compression in SSL on the Glance API<o:p></o:p></p><p class=MsoPlainText>server box.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>There aren't a whole lot of easy ways to do this in OpenSSL 0.9.8, but<o:p></o:p></p><p class=MsoPlainText>you may find the discussion in this article interesting:<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>http://journal.paul.querna.org/articles/2011/04/05/openssl-memory-use/<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Cheers,<o:p></o:p></p><p class=MsoPlainText>jay<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>_______________________________________________<o:p></o:p></p><p class=MsoPlainText>Mailing list: https://launchpad.net/~openstack<o:p></o:p></p><p class=MsoPlainText>Post to : openstack@lists.launchpad.net<o:p></o:p></p><p class=MsoPlainText>Unsubscribe : https://launchpad.net/~openstack<o:p></o:p></p><p class=MsoPlainText>More help : https://help.launchpad.net/ListHelp<o:p></o:p></p></div></body></html>