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Msg Q for user <-> kernel space
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Aashima Raturi
Nov 21, 2006, 11:10:53 PM11/21/06
to
We are using message queue interface for sending messages from kernel to
user space and vice versa.
This works fine for upto 6k packet size and beyond that the kernel crashes.
The error that it gives is kernel stack overflow and sometimes kernel
BUG in sched.c:915!.
I also increased the MSGMNB and MSGMAX values in msg.h.
Could you please suggest how to go about in solving this problem?
user space and vice versa.
This works fine for upto 6k packet size and beyond that the kernel crashes.
The error that it gives is kernel stack overflow and sometimes kernel
BUG in sched.c:915!.
I also increased the MSGMNB and MSGMAX values in msg.h.
Could you please suggest how to go about in solving this problem?
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
Manoj Awasthi
Nov 22, 2006, 2:28:36 AM11/22/06
to
On 11/22/06, Aashima Raturi <aas...@cdotb.ernet.in> wrote:
We are using message queue interface for sending messages from kernel to
user space and vice versa.
This works fine for upto 6k packet size and beyond that the kernel crashes.
The error that it gives is kernel stack overflow and sometimes kernel
BUG in sched.c:915!.
Please mention the kernel version for this to make sense.
I also increased the MSGMNB and MSGMAX values in msg.h.
Could you please suggest how to go about in solving this problem?
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
--
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jyothi
Nov 22, 2006, 4:00:18 AM11/22/06
to
We are using message queue interface for sending messages from kernel to
user space and vice versa.
This works fine for upto 6k packet size and beyond that the kernel crashes.
The error that it gives is kernel stack overflow and sometimes kernel
BUG in sched.c:915!.
Please mention the kernel version for this to make sense.
I am using linux-2.4.20
mayank rana
Nov 22, 2006, 5:02:21 AM11/22/06
to
Hi,
1. You need to recompile your kernel after modifying msg.h file.
2. also try to see message size using /proc/sys/kernel/msgmax
Regards,
_-_Mayank Rana_-_
"The greatest pleasure in life is to do what people say U cannot do."
jyothi <jyo...@cdotb.ernet.in> wrote:
1. You need to recompile your kernel after modifying msg.h file.
2. also try to see message size using /proc/sys/kernel/msgmax
Regards,
_-_Mayank Rana_-_
"The greatest pleasure in life is to do what people say U cannot do."
jyothi <jyo...@cdotb.ernet.in> wrote:
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Rajat Jain
Nov 23, 2006, 10:53:17 PM11/23/06
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On 11/22/06, Aashima Raturi <aas...@cdotb.ernet.in> wrote:
> We are using message queue interface for sending messages from kernel to
> user space and vice versa.
> This works fine for upto 6k packet size and beyond that the kernel crashes.
> The error that it gives is kernel stack overflow and sometimes kernel
> BUG in sched.c:915!.
> I also increased the MSGMNB and MSGMAX values in msg.h.
> Could you please suggest how to go about in solving this problem?
>
> user space and vice versa.
> This works fine for upto 6k packet size and beyond that the kernel crashes.
> The error that it gives is kernel stack overflow and sometimes kernel
> BUG in sched.c:915!.
> I also increased the MSGMNB and MSGMAX values in msg.h.
> Could you please suggest how to go about in solving this problem?
>
Are you creating the temporary packet to be sent to user space as a
local variable? Or kmallocing the memory? In case of local variable,
the problem is quite obvious.
Regards,
Rajat
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