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Re: Swift performance issues with requests

To: Klaus Schürmann <klaus.schuermann@xxxxxxxxxxxxx>
From: Rick Jones <rick.jones2@xxxxxx>
Date: Fri, 31 May 2013 09:56:35 -0700
Cc: "openstack@xxxxxxxxxxxxxxxxxxx" <openstack@xxxxxxxxxxxxxxxxxxx>
In-reply-to: <A10F7A7B4917A54192E18ECDC4945ACF07644A97@EXCHANGE01.mediabeam.loc>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6

On 05/31/2013 04:55 AM, Klaus Schürmann wrote:

Hi,

when I test my new swift cluster I get a strange behavior with GET and PUT requests.
Most time it is really fast. But sometimes it takes a long time to get the data.
Here is an example with the same request which took one time 17 seconds:

...

Can someone explain such behavior?

I'm sure others will suggest storage things to check. Being anetworking type, I will suggest looking into TCP retransmissions.Netstat -s commands can be helpful there. On your client, the proxy andperhaps even your object server(s).


rick jones

References

Swift performance issues with requests
From: Klaus Schürmann, 2013-05-31