Re: [PATCH 0/8] ib/iser: major face lift of the data path code

[Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>]

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On Wed, Feb 3, 2010 at 4:30 PM, Or Gerlitz <ogerlitz-smomgflXvOZWk0Htik3J/w@public.gmane.org> wrote:

> The following patch set removes some in efficiencies in the iser data path
> through simplification and reducing the amount of code, using less atomic
> operations, avoiding TX interrupts, moving to iscsi passthrough mode,
> etc. I did my best to build it as a sequence of patches and not as one
> big re-write, to allow for better debugging (e.g bisection) and tuning.
>
> Or.
>
> [PATCH 01/9] ib/iser: revert commit bba7ebb "avoid recv buffer exhaustion"
> [PATCH 02/9] ib/iser: new recv buffer posting logic
> [PATCH 03/9] ib/iser: remove atomic counter for posted recv buffers
> [PATCH 04/9] ib/iser: use different CQ for send completions
> [PATCH 05/9] ib/iser: simplify send flow/descriptors
> [PATCH 06/9] ib/iser: use atomic allocations
> [PATCH 07/9] ib/iser: remove unnecessary connection checks
> [PATCH 08/9] ib/iser: move to use libiscsi passthrough mode
> [PATCH 09/9] ib/iser: remove redundant locking from iser scsi command
> response flow
>

Sounds really interesting. Do you have numbers available about how much
these patches improve throughput or decrease latency ?

Bart.

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