[EXT] Re: [PATCH v10 3/4] app/dma-perf: validate copied memory

[Gowrishankar Muthukrishnan]

Hi Fengchengwen,

> > +	for (i = 0; i < (nr_buf / nb_workers) * nb_workers; i++) {
> > +		if (memcmp(rte_pktmbuf_mtod(srcs[i], void *),
> > +			   rte_pktmbuf_mtod(dsts[i], void *),
> > +			   cfg->buf_size.cur) != 0) {
> > +			printf("Copy validation fails for buffer number %d\n",
> i);
> 
> For non-mem2mem DMA, like mem2dev or dev2mem, the device host
> address may not direct accessable by CPU (if could may need mmap).
> 

This has been checked in 4/4 patch as (cfg->transfer_dir == RTE_DMA_DIR_MEM_TO_MEM). Would you still need it in this patch only ?.

Thanks,
Gowrishankar

> So pls restrict it only mem2mem, or drop this commit.
> 
> Thanks