Using adb to change kernel parm

[Dave La Mar]

I have read several threads on this and read the man page, but, obviously, am too stupid to figure out the syntax I am looking for.

I had a need to =>"Set strmsgsz to 0 using adb"
In one post A. Clay indicating -
"It's a safe command and this is a common practice for changing kernel
values that otherwise can't be modified."

Now, I realize that I should make the change via sam, etc., for a permanent change. In the scenario I had wanted to perform this, I only wanted a temporary change in order to perform a function that failed due to the current 65535 setting.
That said, what would be the syntax to set this to "0" using adb?

Thanks for any and all input.
dl

[Geoff Wild]

Why not use kmtune?

kmtune -s STRMSGSZ=0

Course - reboot required for change to take effect...

I guess what you want to do is modify the current running kernel with a new value for a non dynamic kernel parameter?

That sounds pretty dangerous to me.

Wait for Clay to answer this one :)

Rgds...Geoff

[Dave La Mar]

Geoff-
"I guess what you want to do is modify the current running kernel with a new value for a non dynamic kernel parameter?"==>Yep.

I was trying to avoid a reboot and have found numerous tech notes on doing this as well as a couple of posts.

As things happened, I was able to get out of the mess without a reboot, but would have been out of the woods sooner if I could have changed that parm in the running kernel.
BTW- Should have included, we're on 11.0.

Thanks.

-dl

[A. Clay Stephenson · Accepted solution]

Okay wimps, this is how it's done although just because something can be done does not mean that it is wise. I'll assume that you have been instructed by a vendor to do this:

To examine the current value:

echo "strmsgsz/D" | adb -k /stand/vmunix /dev/mem

To set the value to zero:
echo "strmsgsz/W 0x0" | adb -w -k /stand/vmunix /dev/mem

You should then run the first command again to verify the change.

/W is used to write a 4-byte value whereas /w is used to write a 2-byte value; these are the opposite of /D and /d respectively.

I did test this on a sandbox and it lived to tell the tale.

[Dave La Mar]

Got it.
Thank you A. Clay.

Regards,

-dl