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

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

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@suse.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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[PATCH V2 3/3] scsi: mptxsas: offload IRQ execution Sinan Kaya <okaya@codeaurora.org> - 2015-11-09 03:00 +0100
  Re: [PATCH V2 3/3] scsi: mptxsas: offload IRQ execution Hannes Reinecke <hare@suse.de> - 2015-11-09 08:20 +0100
    Re: [PATCH V2 3/3] scsi: mptxsas: offload IRQ execution Sinan Kaya <okaya@codeaurora.org> - 2015-11-09 15:10 +0100
    Re: [PATCH V2 3/3] scsi: mptxsas: offload IRQ execution Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 07:10 +0100

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