Date: Wed, 29 Feb 2012 10:10:57 -0300 From: Rafael Ganascim <rganascim@gmail.com> To: freebsd-net@freebsd.org Subject: Igb driver - header split feature Message-ID: <CAD4ZOMwZmDV30s%2BTgQ2eBMBtb10=U3wvTLfF_5nSUHdNpH=i6g@mail.gmail.com>
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Hi list, I was looking in the igb driver that I use on some Intel nics (dualport and quadport gigabit) and in the source code, the feature: /* ** Header split causes the packet header to ** be dma'd to a seperate mbuf from the payload. ** this can have memory alignment benefits. But ** another plus is that small packets often fit ** into the header and thus use no cluster. Its ** a very workload dependent type feature. */ Somebody is using this feature? What's the results? I think that this feature can be helpfull to improve the performance, allowing the processing of the packet headers more fastest (pfills, routing, etc). Is this true? Thanks in advance. Rafael
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