openstack team mailing list archive

[Hugo <tonytkdk@xxxxxxxxx>]

Sorry for the previous question of pound connections limit!
It caused by OS limit instead of Pound!


Thanks
Hugo Kuo 

從我的 iPhone 傳送

"Reddin, Tim (Cloud Services)" <Tim.Reddin@xxxxxx> 於 2011/9/20 上午12:24 寫道：

> 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: openstack-bounces+tim.reddin=hp.com@xxxxxxxxxxxxxxxxxxx [mailto:openstack-bounces+tim.reddin=hp.com@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jay Pipes
> Sent: 19 September 2011 16:39
> To: Kuo Hugo
> Cc: openstack@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Openstack] Load Balancers for Swift Proxy-servers ----why Pound ?
> 
>  
> 
> On Mon, Sep 19, 2011 at 7:47 AM, Kuo Hugo <tonytkdk@xxxxxxxxx> 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
> 
>  
> 
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