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Thanks for your inputs Edward and Pete. I'll set  sysctl net.ipv4.tcp_tw_reuse.

On Fri, Jul 11, 2014 at 8:05 AM, Pete Zaitcev <zaitcev at redhat.com> wrote:
> On Tue, 8 Jul 2014 16:26:10 -0700
> Shrinand Javadekar <shrinand at maginatics.com> wrote:
>
>> I see that these servers do not use a persistent http connection
>> between them. So every blob get/put/delete request will create a new
>> connection, use it and tear it down. In a highly concurrent
>> environment with thousands of such operations happening per second,
>> there could be two problems:
>
> It's a well-known problem in Swift. Operators with proxies driving
> sufficient traffic for it to manifest set sysctl net.ipv4.tcp_tw_reuse.
>
> There were attempts to reuse connections, but they floundered upon
> the complexities of actually implementing a connection cache.
> Keep in mind that you still have to allow simultaneous connections
> to the same node for concurrency. It snowballs quickly.
>
> -- Pete