Tags:
tag this topic
create new tag
view all tags
<!-- keep this as a security measure: * Set ALLOWTOPICCHANGE = Main.TWikiAdminGroup,Main.LCGAdminGroup * Set ALLOWTOPICRENAME = Main.TWikiAdminGroup,Main.LCGAdminGroup #uncomment this if you want the page only be viewable by the internal people * #Set ALLOWTOPICVIEW = Main.TWikiAdminGroup,Main.LCGAdminGroup --> ---+ Throughput Tests Throughput tests to find maximal effective bandwidth and optimum conditions for specific channels. These tests are done with low level tools to discover principal problems of routes. There is no sense in doing complicated measurements on top of the whole middleware stack if issues already appear at this level. These measurements were done from our DPM machine running on a Linux 2.4 kernel. * [[ThroughputTestFNAL][FNAL]] (Some problems!) * [[ThroughputTestFZK][FZK]] (ok) * [[ThroughputTestASGC][ASGC]] (bad, lossy connection; improvement seen on May 5th 2007) Measurements using a Linux 2.6 kernel machine: * [[ThroughputTestASGC2][ASGC]] (improved) Wenji Wu from FNAL has pointed out that the TCP congestion algorithm can play a big role. For connections with very long RTT (> 100 ms) he had quite good results using the _CUBIC_ algorithm instead of the standard _TCP Reno_ algorithm. Linux 2.4 does not offer the possibilities of choosing these algorithms via sysctl. So we should remeasure some of our connections using another host running Linux 2.6. Also, we need to study how to tune our Solaris10 Thumpers, which now make up the new SE. I had done some FTS tests in September 2006, but rather in an unsystematic way: * [[FTSChannelDebugging][FTS STAR-CSCS channel debugging]] -- Main.DerekFeichtinger - 30 Apr 2007
Attachments
Attachments
Topic attachments
I
Attachment
History
Action
Size
Date
Who
Comment
sh
doIperf.sh
r2
r1
manage
4.4 K
2007-06-01 - 08:16
DerekFeichtinger
txt
parseIperfLog.pl.txt
r2
r1
manage
6.4 K
2007-06-01 - 08:16
DerekFeichtinger
E
dit
|
A
ttach
|
Watch
|
P
rint version
|
H
istory
: r11
<
r10
<
r9
<
r8
<
r7
|
B
acklinks
|
V
iew topic
|
Ra
w
edit
|
M
ore topic actions
Topic revision: r11 - 2007-06-01
-
DerekFeichtinger
LCGTier2
Log In
(Topic)
LCGTier2 Web
Create New Topic
Index
Search
Changes
Notifications
Statistics
Preferences
Users
Entry point / Contact
RoadMap
ATLAS Pages
CMS Pages
CMS User Howto
CHIPP CB
Outreach
Technical
Cluster details
Services
Hardware and OS
Tools & Tips
Monitoring
Logs
Maintenances
Meetings
Tests
Issues
Blog
Home
Site map
CmsTier3 web
LCGTier2 web
PhaseC web
Main web
Sandbox web
TWiki web
LCGTier2 Web
Users
Groups
Index
Search
Changes
Notifications
RSS Feed
Statistics
Preferences
P
P
View
Raw View
Print version
Find backlinks
History
More topic actions
Edit
Raw edit
Attach file or image
Edit topic preference settings
Set new parent
More topic actions
Warning: Can't find topic "".""
Account
Log In
E
dit
A
ttach
Copyright © 2008-2024 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki?
Send feedback