Re: multipath IB/srp fail-over testing lands up in dump stack in swiotlb_alloc_coherent()

Bart Van Assche
2016-06-15T12:51:18Z

On 06/15/2016 02:02 PM, Laurence Oberman wrote:
> We are missing something here

The source code excerpts in my previous e-mail came from the latest
Linux kernel (v4.7-rc3). Maybe older kernels behave in a different way.

BTW, did you run into the "swiotlb buffer is full" error messages while
testing 4MB I/O? Have you already considered to reduce the memory that
is needed for RDMA queues by reducing the queue depth? I ran my SRP
tests with default swiotlb buffer size and with the following in
srp_daemon.conf:

a queue_size=32,max_cmd_per_lun=32,max_sect=8192

Bart.