Re: [PATCH v2 3/4] examples/dma: support enqueue drop statistic

[Bruce Richardson <bruce.richardson@intel.com>]

On Sat, Apr 16, 2022 at 02:19:24PM +0800, fengchengwen wrote:
> DMA is a memcopy engine, and from that perspective, I think it's appropriate
> to use copy_failures when dma_enqueue fails.
> 
> The newly added enqueue_failures is mainly used for rte_ring_enqueue_burst
> failures.
> 
> Since the app doesn't have a command line, I think adding this field can
> immediately identify where it failed.
> 

So one stat is for the HW path and the other is for the SW one? If that is
the case, only one stat should probably be printed out by the app depending
on the mode is it in.

> On 2022/4/13 23:01, Bruce Richardson wrote:
> > On Mon, Apr 11, 2022 at 08:14:58PM +0800, Chengwen Feng wrote:
> >> The copy drop statistic counted in two scenarios: DMA copy failures and
> >> enqueue failures. so it is difficult to locate the problem.
> >>
> > 
> > Is the app actually tracking copy failures? From a quick glance at the code
> > it looks to me like the only "copy_failures" are the enqueue failures, in
> > which case the stat should just be renamed.
> > 
> >> This patch adds enqueue drop statistic to fix the it.
> >>
> >> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> >> ---
> >>  examples/dma/dmafwd.c | 14 +++++++++-----
> >>  1 file changed, 9 insertions(+), 5 deletions(-)
> >>
> > 
> > .
> > 
>