Also, Since seg_len gives information to the implementation as to how many bytes are required to be contiguous on the first segment for faster access. I would like to have the value of seg_len as something in the lines of 256 or 512 bytes rather than 3K or 9K.
Regards, Bala On 2 July 2015 at 02:36, Bill Fischofer <bill.fischo...@linaro.org> wrote: > The ODP API does not mandate that an implementation uses segments, only > that applications can discover and work with any segments that may be > present. > > So it is not possible to force an implementation to use segments since, as > Stuart points out, seg_len is simply an application minimum value that > implementations can increase as needed. > > In fixing Bug 1661 <https://bugs.linaro.org/show_bug.cgi?id=1661> I extended > the odp_packet test <http://patches.opendataplane.org/patch/1956/> to > allocate a packet of 5 times the configured minimum segment length > (ODP_CONFIG_PACKET_SEG_LEN_MIN) to test the segment APIs against a packet > that would likely be segmented on most implementations, but again there's > no guarantee that a given implementation will actually create a segmented > packet. > > In any event, if you wish to "play the odds" you need to base these > calculations on ODP_CONFIG_PACKET_SEG_LEN_MIN rather than some > application-chosen value since that's the only insight into what the > implementation will guarantee in terms of minimum segmentation. > > On Wed, Jul 1, 2015 at 5:03 AM, Stuart Haslam <stuart.has...@linaro.org> > wrote: > >> On Wed, Jul 01, 2015 at 01:00:07PM +0530, Bala Manoharan wrote: >> > If the idea of this patch is to test segmented packets it can be >> > accomplished by allocating packets of size greater than "seg_len" in an >> > additional test case rather than modifying the segment length in pool >> > create function. >> > >> > Regards, >> > Bala >> > >> >> Yes but the pool seg_len is already larger than a max sized jumbo frame, >> so we wouldn't be able to allocate and send a packet larger than that. >> >> -- >> Stuart. >> _______________________________________________ >> lng-odp mailing list >> lng-odp@lists.linaro.org >> https://lists.linaro.org/mailman/listinfo/lng-odp >> > >
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