Hi Robert,
I noticed that you used the build-in NIC to access Internet. As I said,
ndis.sys is a interface library for NIC driver. As well as you have proved
that it is the ndis.sys which caused the DPC usage. For these reasons, I
suspect it is the buil-in NIC which caused the problem. I noticed that you
have an additional NIC. Can you temporarily disable the build-in NIC and
access Internet via the external NIC?
Best regards,
Vincent Xu
Microsoft Online Partner Support
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Thread-Topic: Deferred procedure calls
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Subject: RE: Deferred procedure calls
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Hello, Vincent. Sorry I didn't respond to your 11 April post - I thought
that I had set the thread to auto-notify me of posts and I haven't been
looking for replies on a manual basis.
I still have the problem big-time but I do have some more information
which
may be of use. I have recently upgraded my cable service and, coupled
with
improvements by my ISP, my download speed has gone from 1Mbps to 10Mbps,
so I
was interested to see what this would do the DPC problem. For testing
purposes I disconnected my local network so the only internet user is my
computer (via the built-in network port) and it now takes less than an
hour
to get to more than 50% DPC's! However, when I come off-line, the DPC
value
drops very rapidly and 'normal' service (up to 5% DPC's) is resumed with
a
few minutes. As soon as I go back on line, DPC's rise quickly again.
To me, this shows that it is not just an ICS problem (although it is
worse
when my family are uing their computers to access the internet via the
network) and I wonder if it down to the architecture of my computer. The
main hard drive is a serial ATA drive and the machine has no motherboard
connections for SCSI equipment, so my second (SCSI) drive (on which the
Windows paging file is situated) is connected via an UltraATA 133 PCI
card.
There is no doubt that the serial bus is going to be very busy and, as
Bob
suggested, this is probably the problem.
I intend to purchase a router to get rid of the ICS issues, but do you
have
any other suggestions as to how I can improve things?
Thanks.
Robert
--
Dell Dimension 9100 Pentium D 2.80GHz
1GB RAM
Windows XP Prof SP2
Office 2003
HDD1: 250GB Serial ATA
HDD2: 250GB SCSI
ATI Radeon X600 256MB
Soundblaster Live! 24-bit
McAfee V_Scan / P_Firewall
:
Hi Robert,
How is everything going? If you have any updates or need any further
assistance on this issue, please feel free to let me know. I am glad to
be
of assistance.
Have a nice day!
Best regards,
Vincent Xu
Microsoft Online Partner Support
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Date: Wed, 12 Apr 2006 06:43:13 GMT
Subject: RE: Deferred procedure calls
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Hi Robert,
Sorry for not reply in this thread because I feel I could scarcely
edge
in
a word into the conversation between you and Bob. As well as, I
thought
you
have taken Bob's suggestion as a workaround. Sorry for my mistake.
I must say, if you want to troubleshooting for the root cause, I will
be
glad to be of assistance.
Actually, ndis.sys is a interface library for NIC driver. From your
description, it appears that the NIC firmware conflicts with the
ndis.sys.
I'd like to confirm that:
1, If the problem only happens when you use ICS?
2, If the problem occurs if you change the functioin of the two NICs?
3, As a troubleshooting method, we usualy suggest our user replace a
new
NIC to check if this problem was caused by NIC. However, the
problematic
NIC is built-in of the mainboard. If possible, you can attach a new
NIC
and
disable the built-in NIC to have a test.
Let me know if you still have questions or concerns.
Best regards,
Vincent Xu
Microsoft Online Partner Support
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Thread-Topic: Deferred procedure calls
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Subject: Deferred procedure calls
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About 4 months ago I bought a new Pentium D from Dell and
transferred
all
my
apps from my old P4. Apart from the change from P4 to D, the only
other
changes of significance were moving from XP Home SP2 to XP Prof SP2
and
upgrading Office 2000 to Office 2003.
From the very start of using the new machine, I got stuttering
audio
and
jerky video, and after some help from the Dell message board, this
was
diagnosed as excessive levels of Deferred Procedure Calls due to
out-of-date
video drivers. I upgraded these and the audio and video are now
much
improved but the problem of DPC's has not gone away. For example,
this
afternoon after running a number of internet file transferring apps
for
several hours, Process Explorer reported that between 20% and 50%
of
CPU
time
was being used by DPC's. Not surprisingly, the machine was running
very
slowly and the screen cursor was moving in big jumps!
I have done a little investigation and have discovered a Microsoft
tool
called RATTV3 which helps analyse driver file performance and I
have
run
this
for the last 36 hours. If I interpret the report correctly, this
tells
me
that the principal culprit in generating high levels of DPC's in
excess
of
1ms is ndis.sys. (Tcpip.sys also generates quite a lot but nothing
like
as
many as ndis.sys).
I do not know how to interpret the figures that RATT produces and I
hope
that someone here will be able to. RATT shows that over a 36 hour
monitoring
period ndis.sys generated nearly 30million DPC's, of which nearly 3
million
were more than 1ms, 625,000 were more than 10ms and 113 were more
than
1
second.
Is this normal? Is this the source of the excessive DPC's? If it
is,
what
can I do about it? If it isn't, what might be the problem? My
