2015-11-25 11:00, Bruce Richardson:
> On Wed, Nov 25, 2015 at 11:23:57AM +0100, Thomas Monjalon wrote:
> > 2015-11-25 10:08, Bruce Richardson:
> > > On Wed, Nov 25, 2015 at 03:39:17PM +0900, Younghwan Go wrote:
> > > > Hi Jianfeng,
> > > >
> > > > Thanks for the email. rte mempool was successfully created without any
> > > > error. Now the next problem is that rte_eth_rx_burst() is always
> > > > returning 0
> > > > as if there was no packet to receive... Do you have any suggestion on
> > > > what
> > > > might be causing this issue? In the meantime, I will be digging through
> > > > ixgbe driver code to see what's going on.
> > > >
> > > > Thank you,
> > > > Younghwan
> > > >
> > >
> > > The problem is that with --no-huge we don't have the physical address of
> > > the memory
> > > to write to the network card. That's what it's marked as for testing only.
> >
> > Even with rte_mem_virt2phy() + rte_mem_lock_page() ?
> >
> With no-huge, we just set up a single memory segment at startup and set its
> "physaddr" to be the virtual address.
>
> /* hugetlbfs can be disabled */
> if (internal_config.no_hugetlbfs) {
> addr = mmap(NULL, internal_config.memory, PROT_READ |
> PROT_WRITE,
> MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
> if (addr == MAP_FAILED) {
> RTE_LOG(ERR, EAL, "%s: mmap() failed: %s\n", __func__,
> strerror(errno));
> return -1;
> }
> mcfg->memseg[0].phys_addr = (phys_addr_t)(uintptr_t)addr;
rte_mem_virt2phy() does not use memseg.phys_addr but /proc/self/pagemap:
/*
* the pfn (page frame number) are bits 0-54 (see
* pagemap.txt in linux Documentation)
*/
physaddr = ((page & 0x7fffffffffffffULL) * page_size)
+ ((unsigned long)virtaddr % page_size);
