curious ab result when -k option included?

[Monty Ree]

Hello, all.

When I execute ab(apache bentch) to test the varnish performance, I have 
found curious result.
If I set -k option which means Keepalive like below, I can't see the 
result. 

with -k option : Requests per second:    10.96 [#/sec] (mean)
without -k option : Requests per second:    5302 [#/sec] (mean)

ab -k -n 1000 -c 100 http://example.com/images/test.gif

Why this result happens? varnish doesn't support keepalive?


Thanks for your help.

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