Robert Craig
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RE: RE: RE: Expected latency values for MsgSend ?
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Robert Craig
04/16/2009 9:24 AM
post27210
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RE: RE: RE: Expected latency values for MsgSend ?
Hi Ashwin:
I don't know if I'd call the devn behaviour an "issue". It's a
network driver that's communicating with the network and uses CPU, so
it's perfectly normal (and, in fact, it's a requirement) for it to take
the CPU away from a process that is running at a lower priority.
Those numbers are looking a bit more reasonable though :>.
Robert.
-----Original Message-----
From: Ashwin Patwekar [mailto:community-noreply@qnx.com]
Sent: Thursday, April 16, 2009 5:44 AM
To: ostech-core_os
Subject: Re: RE: RE: Expected latency values for MsgSend ?
Hi Robert,
Thanks for the reply.
The priority changing did give consistent times.
This system has 16666666 cycles/sec.
min : 0.000110 max: 0.000141 avg: 0.000113 min : 0.000109 max: 0.000134
avg: 0.000113 min : 0.000110 max: 0.000144 avg: 0.000113 min : 0.000110
max: 0.000133 avg: 0.000113 min : 0.000110 max: 0.000134 avg: 0.000113
min : 0.000110 max: 0.000134 avg: 0.000113 min : 0.000109 max: 0.000132
avg: 0.000113 min : 0.000109 max: 0.000135 avg: 0.000113 min : 0.000110
max: 0.000133 avg: 0.000113 min : 0.000110 max: 0.000134 avg: 0.000113
min : 0.000110 max: 0.000133 avg: 0.000113 min : 0.000109 max: 0.000134
avg: 0.000113
without the -p option the timinigs w/o devn driver are # ./client This
system has 16666666 cycles/sec.
min : 0.000108 max: 0.000183 avg: 0.000111 min : 0.000108 max: 0.000177
avg: 0.000111 min : 0.000108 max: 0.000181 avg: 0.000111 min : 0.000108
max: 0.000191 avg: 0.000111 min : 0.000108 max: 0.000176 avg: 0.000111
min : 0.000108 max: 0.000177 avg: 0.000111 min : 0.000108 max: 0.000183
avg: 0.000112 min : 0.000108 max: 0.000181 avg: 0.000111 min : 0.000108
max: 0.000178 avg: 0.000111 min : 0.000108 max: 0.000184 avg: 0.000111
min : 0.000108 max: 0.000190 avg: 0.000111 min : 0.000108 max: 0.000183
avg: 0.000112
So the issue seems to be in the devn driver for the hardware which is
different from the devn driver for FADS.
Thanks and Regards,
Ashwin
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OSTech
http://community.qnx.com/sf/go/post27174
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