Bug 40103
| Summary: | Slowly SCSI on a NCR53C876 cause high load | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Need Real Name <ferulisses> |
| Component: | kernel | Assignee: | Arjan van de Ven <arjanv> |
| Status: | CLOSED RAWHIDE | QA Contact: | Brock Organ <borgan> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 7.1 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2001-05-10 20:57:49 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: | |||
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Description
Need Real Name
2001-05-10 16:35:35 UTC
Can you paste a "top" screen to this bug? (eg so we can see which processes eat the CPU) Or even the output of "ps waux" so we can see which processes are causing the high load? Alternatively, we are working on an upgraded kernel with a newer NCR scsi driver, a recent snapshot of the RPM for that kernel can be found in the rawhide part of our ftp site. Some hours after, the system was consumming 100% of resources, and the computer was inacessible, I need to reset. After this, I made more tests: - tried to use the sym53c876 modules - reboot and got system consumming 80% of resources after 30 minutes - tried to remove cbq and shaper modules - reboot and got system consumming 80% of resources after 30 minutes - downgrade to 2.2.16smp kernel from RedHat 7.0 disk - 45 minutes of uptime now, system at average of 10% Now my system look stable. But the problem still exists. I can't take a screen now because it's a production server and I can't reboot to kernel 2.4 and wait crash, but I saw nothing anormal in top command, just normal process using very low CPU, the sum of all process was bellow 50%. If it's a tip, the top process is squid, running at 10%-20% of CPU, may be him make all data traffic to the system goes to crash. There are any previsible problem with kernel downgrade ? If you don't have hostile local users, 2.2.16 should be fine for most stuff. (only not for usb, but it doesn't look like you are using that ;) We have an upgraded driver in rawhide which should fix this -> closing as fixed in rawhide. Using 2.2.16 is an alternative. hi again.
I made a upgrade to kernel 2.4.3-12enterprise for i686 from RedHat Errata.
The problem persist. here is the header of top.
8:39am up 48 min, 1 user, load average: 0.85, 0.83, 0.64
82 processes: 81 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states: 6.3% user, 67.2% system, 0.0% nice, 25.3% idle
CPU1 states: 5.3% user, 65.3% system, 0.0% nice, 28.3% idle
Mem: 512868K av, 499144K used, 13724K free, 56K shrd, 242120K buff
Swap: 556012K av, 292K used, 555720K free 153496K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
1041 squid 16 0 19852 19M 1404 S 45.0 3.8 9:01 squid
826 netsaint 9 0 1088 1088 792 S 4.9 0.2 0:26 netsaint
14092 root 9 0 2444 2444 1980 S 3.1 0.4 0:00 sendmail
14047 root 10 0 2444 2444 1980 S 1.9 0.4 0:00 sendmail
549 root 9 0 1956 1952 1760 S 1.7 0.3 0:02 sendmail
13860 root 16 0 1028 1028 768 R 1.5 0.2 0:00 top
14011 root 10 0 2440 2440 1980 S 1.1 0.4 0:00 sendmail
13188 root 9 0 2428 2428 1964 S 0.5 0.4 0:01 sendmail
13293 root 9 0 2428 2428 1968 S 0.5 0.4 0:01 sendmail
14109 root 9 0 2420 2420 1988 S 0.5 0.4 0:00 sendmail
13114 apache 8 0 4016 4004 3592 S 0.3 0.7 0:00 httpd
14065 root 9 0 2476 2476 1932 S 0.3 0.4 0:00 sendmail
14106 root 9 0 2300 2300 1960 S 0.3 0.4 0:00 sendmail
14107 root 9 0 2312 2312 2052 S 0.3 0.4 0:00 sendmail
14112 netsaint 9 0 540 540 476 S 0.3 0.1 0:00 check_ping
6 root 9 0 0 0 0 SW 0.1 0.0 0:01 kupdated
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