Re: SRP subnet timeout

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 9/26/19 7:10 AM, Karandeep Chahal wrote:
I am wondering why SRP REQ CM timeout is "subnet_timeout + 2". What was the
reason behind adding 2 to the subnet timeout? I think it was added by Bart
in commit 4c532d6ce14bb3fb4e1cb2d29fafdd7d6bded51c, but the commit message
does not explain why the 2 is necessary. Would anyone happen to know?

My understanding is that adding 2 causes the CM timeout value to become 4 times the subnet_timeout value. Hence, even if you have a reasonable subnet_timeout
the CM REQ timeout becomes too high.

Hi Karan,

I think the description of that commit explains why that change has been made:

    IB/srp: Make CM timeout dependent on subnet timeout

    For small networks it is safe to reduce the subnet timeout from
    its default value (18 for opensm) to 16. Make the SRP CM timeout
    dependent on the subnet timeout such that decreasing the subnet
    timeout also causes SRP failover and failback to occur faster.

Bart.



[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Photo]     [Yosemite News]     [Yosemite Photos]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux