[PATCH V2 3/3] scsi: mptxsas: offload IRQ execution

On 11/10/2015 12:59 AM, Sinan Kaya wrote:

On 11/9/2015 2:15 AM, Hannes Reinecke wrote:

quoted

On 11/09/2015 02:57 AM, Sinan Kaya wrote:

quoted

The mpt2sas and mpt3sas drivers are spinning forever in
their IRQ handlers if there are a lot of jobs queued up
by the PCIe card. This handler is causing spikes for
the rest of the system and sluggish behavior.

Marking all MSI interrupts as non-shared and moving the
MSI interrupts to thread context. This relexes the rest
of the system execution.

NACK.

If there is a scalability issue when handling interrupts
it should be fixed in the driver directly.

Looking at the driver is should be possible to implement
a worker thread handling the reply descriptor, and having the
interrupt only to fetch the reply descriptor.

Can you go into the detail about which part of the _base_interrupt
function needs to be executed in ISR context and which part can be
queued up to worker thread?

I'm not familiar with the hardware or the code. That's why, I moved the
entire ISR into the thread context.

Hannes or others, any suggestions?

Thanks,
Christopher Covington

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