Bug 10225
Summary: | Stuck TCP sockets on SMP Netfinity | ||
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Product: | [Retired] Red Hat Linux | Reporter: | Marc Provitt <mprov> |
Component: | kernel | Assignee: | Michael K. Johnson <johnsonm> |
Status: | CLOSED WORKSFORME | QA Contact: | |
Severity: | high | Docs Contact: | |
Priority: | medium | ||
Version: | 6.1 | CC: | linux, wil |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i386 | ||
OS: | Linux | ||
URL: | http://www.zkey.com | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2000-03-21 14:15:12 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Marc Provitt
2000-03-17 23:49:01 UTC
Firstly TIME_WAIT is not an error. Its a protocol requirement. TCP requires this to avoid the risk of data corruption with other sessions. Im sure you'd prefer intact email. TIME_WAIT lasts 120 seconds. Thus a heavy polling rate of thousands of mail clients would cause and you would expect to see a lot of TIME_WAIT sockets, especially if you have people using silly (eg 5 second) poll rates. How many connections/minute is your IMAP running at ? Ok the system info you sent shows nothing at all out of the ordinary either in configuration or setup. I see no obvious reasons for problems. I see two possible issues here: 1. Someone is despite your claims otherwise polling very fast running you out of resource 2. You have a lot of large mailboxes and Cyrus is not using maildir format. That can cause a huge amount of I/O and memory usage reformatting mailboxes after changes. Both are speculation. I'd need to look at netstat output to judge further. Can you do echo "1" >/proc/sys/net/ipv4/tcp_syncookies and when the box gets loaded tell me if 'dmesg' and the logs show any messages abotu sending syn cookies. You appear to be running cyrus imapd as a standalone daemon - this is a correct assumption o my part ? No response since March: closing |