Hi All, Is there a way to create a mempool such that all mbufs are aligned to X. lets say X is 512.
Thanks. On Sat, Oct 11, 2014 at 5:04 PM, Alex Markuze <alex at weka.io> wrote: > O.k, And how would I do that? > I'm guessing there is something I can control in rte_pktmbuf_pool_init? > I would appreciate If you could spare a word or two in the matter. > > On Tue, Oct 7, 2014 at 7:11 PM, Ananyev, Konstantin < > konstantin.ananyev at intel.com> wrote: > >> >> >> > -----Original Message----- >> > From: Ananyev, Konstantin >> > Sent: Tuesday, October 07, 2014 5:03 PM >> > To: Ananyev, Konstantin >> > Subject: FW: [dpdk-dev] Aligned RX data. >> > >> > >> > >> > From: Alex Markuze [mailto:alex at weka.io] >> > Sent: Tuesday, October 07, 2014 4:52 PM >> > To: Ananyev, Konstantin >> > Cc: dev at dpdk.org >> > Subject: Re: [dpdk-dev] Aligned RX data. >> > >> > RTE_PKTMBUF_HEADROOM defines the headroom >> >> Yes. >> >> >this would be true only if the buff_start was aligned to 512 which is >> not. >> >> As I said: " Make sure that your all your mbufs are aligned by 512". >> >> Konstantin >> >> > >> > On Tue, Oct 7, 2014 at 1:05 PM, Ananyev, Konstantin < >> konstantin.ananyev at intel.com> wrote: >> > >> > >> > > -----Original Message----- >> > > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Alex Markuze >> > > Sent: Tuesday, October 07, 2014 10:40 AM >> > > To: dev at dpdk.org >> > > Subject: [dpdk-dev] Aligned RX data. >> > > >> > > Hi , I'm trying to receive aligned packets from the wire. >> > > Meaning that for all received packets the pkt.data is always aligned >> to >> > > (512 -H). >> > > >> > > Looking at the pmds of ixgbe/vmxnet I see that the pmds call >> > > __rte_mbuf_raw_alloc and set the rx descriptor with a >> > > RTE_MBUF_DATA_DMA_ADDR_DEFAULT >> > > Instead of the more appropriate RTE_MBUF_DATA_DMA_ADDR. >> > > >> > > Do I need to modify each pmd I'm using to be able to receive aligned >> data? >> > Make sure that your all your mbufs are aligned by 512 and set in your >> config RTE_PKTMBUF_HEADROOM=512-H? >> > >> > >> > > Or have I missed something? >> > > >> > > Thanks >> >> >
