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Re: Stalls when PUT-ing to Amazon S3

From: <koettermarkus_at_gmx.de>
Date: Fri, 19 Dec 2008 00:24:18 +0100

Dustin J. Mitchell wrote:
> We're grasping at straws here, and interested in any ideas, no matter
> how hairbrained!

Had a look on the pcap, some random thoughts,

  * amazons acks are coming in way to slow, at packet #1800 amazon
acks=871627, #1801 sends packet seqnr=1737715

  * packet #4674, amazon sends an ack=3866967, acking packet #4482 - 2
minutes later.

  * 192.168/16 made me think you are masqueraded and your router
rewrites the packets, maybe mtu clamping renders the pcap useless?

  * captured on a direct connected system or the router instead?

  * tried disabling window scaling?

  * tried disabling sack?

  * tried slowing down the upload to check if the problem persists?

It is really interesting, but can't be curls fault.

MfG
Markus
Received on 2008-12-19

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