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Description of problem: When sending emails with attachments the server would be occasionally very slow. The email client would be tied up trying to send. Version-Release number of selected component (if applicable): Running Fedora Core 2 with - kernel 2.6.7-1.494.2.2 - sendmail-8.12.11-4.6 How reproducible: Cyclical. At points it wouldn't happen at all then you'd have a point were nearly everytime you tried to send an email with an attachment it would slow to a crawl. Steps to Reproduce: 1. Attempted to send email with attachment from a windows machine using a linux machine with the above kernel/sendmail running. 2. 3. Actual results: Occasionally email would take a very long time to be sent from the email client to the linux server Expected results: Communication to be quicker Additional info: I switched back to kernel 2.6.6-1.435.2.3 and the problem seemed to vanish.
Default values of these parameters in kernel 2.6.7: net.ipv4.tcp_default_win_scale = 7 net.ipv4.tcp_moderate_rcvbuf = 1 These values in kernel 2.6.6 were both zero. I ran the following and it seemed to fix my problem: sysctl -w net.ipv4.tcp_default_win_scale=0 sysctl -w net.ipv4.tcp_moderate_rcvbuf=0
mass update for old bugs: Is this still a problem in the 2.6.9 based kernel update ?
Fedora Core 2 has now reached end of life, and no further updates will be provided by Red Hat. The Fedora legacy project will be producing further kernel updates for security problems only. If this bug has not been fixed in the latest Fedora Core 2 update kernel, please try to reproduce it under Fedora Core 3, and reopen if necessary, changing the product version accordingly. Thank you.