Hi all, I have a mirror service with Ubuntu content, redirected via a L7 front end to an ATS host running 4.1.2. I get an unusual behaviour where content delivery stalls with consecutive requests.
Across the archive whole, it's efficient and fast, but I can trip it up with a single client, and the apt-get process often stalls for individual users. I'm at a bit of a loss as to why. I've eliminated the L7 front end, and I've eliminated the content backends as the cause of the fault. If I remove ATS from the path, or talk to either end directly, the service is reliable and consistent. If I download a single metadata file using a single host, such as a Packages.bz2 from the archive, the system will deliver the file somewhere between 3 to 20 times quickly, then pause for up to around a minute. The pause length isn't consistent. A TCP capture shows a client waiting for data after a request, with all TCP behaviours being correct otherwise. The ATS transfer log itself shows TCP_HITs as it should. I know it's not revalidating against the backend within the revalidation period. I've also removed iptables/conntrack from the possible list of causes (by disabling it completely). The server is Ubuntu 64-bit 13.10, and around 99.7% idle. Does anyone have suggestions as to where I should start looking? My Google-fu is failing me for finding similar problems. David Jericho Senior Systems Administrator AARNet Pty Ltd t. +61 (0) 7 3317 9576 m. +61 423 027 185 e. [email protected] w. www.aarnet.edu.au street address: Ground Floor, 143 Coronation Drive, Milton, QLD, 4064, Australia Please consider the environment before printing this email. important This email and any files transmitted with it are confidential, and the rights of confidentiality in such information are not waived or lost by its mistaken delivery to you. Any dissemination, copying, use or disclosure of the email and/or such files without the permission of AARNet, or the sender, is strictly prohibited. If you have received this email in error, please contact the sender immediately and delete all copies of this transmission.
