Jay wrote:
>> FYI, some folks have done some performance testing of Glance with Swift backends. It was determined that using SSL caused a dramatic performance degradation (roughly decreased the network I/O throughput by half, with a queuing behvaiour showing up on GET requests as well.) The solution was to disable zlib compression in SSL on the Glance API server box. << Our initial tests used an image dervied from /dev/urandom which was an absolute worst case for compression. 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. As Jay points out – replacing the compression algorithm is not easy. Tim -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jay Pipes Sent: 19 September 2011 16:39 To: Kuo Hugo Cc: [email protected] Subject: Re: [Openstack] Load Balancers for Swift Proxy-servers ----why Pound ? On Mon, Sep 19, 2011 at 7:47 AM, Kuo Hugo <[email protected]> wrote: > btw , most of articles just using HTTP instead of HTTPS. Does Pound better > than Nginx under HTTPS? FYI, some folks have done some performance testing of Glance with Swift backends. It was determined that using SSL caused a dramatic performance degradation (roughly decreased the network I/O throughput by half, with a queuing behvaiour showing up on GET requests as well.) The solution was to disable zlib compression in SSL on the Glance API server box. There aren't a whole lot of easy ways to do this in OpenSSL 0.9.8, but you may find the discussion in this article interesting: http://journal.paul.querna.org/articles/2011/04/05/openssl-memory-use/ Cheers, jay _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : [email protected] Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
_______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : [email protected] Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
