Date: Fri, 8 Mar 2013 12:33:09 -0800 From: Jack Vogel <jfvogel@gmail.com> To: Garrett Wollman <wollman@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: UNS: Re: Limits on jumbo mbuf cluster allocation Message-ID: <CAFOYbcnHy%2BOh2kjYTG7zj=te2Wi4A6vAOZKmYttMt12EoeW=WQ@mail.gmail.com> In-Reply-To: <20794.18907.530374.164737@hergotha.csail.mit.edu> References: <20793.36593.774795.720959@hergotha.csail.mit.edu> <51399926.6020201@freebsd.org> <CAFOYbc=x7U-s70KvcZJdrVP6v-On716qMi=HN1P2Kj%2Bd_K972A@mail.gmail.com> <20794.6692.191898.682241@hergotha.csail.mit.edu> <513A2887.2010408@freebsd.org> <CAFOYbc=7iROKzUwnB0fMR=ix8VFo%2BONfG=NX43jeF7jkp74JhQ@mail.gmail.com> <20794.18907.530374.164737@hergotha.csail.mit.edu>
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Yes, the write-back descriptor has a bit in the status field that says its EOP (end of packet) or not. Jack On Fri, Mar 8, 2013 at 12:28 PM, Garrett Wollman <wollman@freebsd.org>wrote: > <<On Fri, 8 Mar 2013 12:13:28 -0800, Jack Vogel <jfvogel@gmail.com> said: > > > Yes, in the past the code was in this form, it should work fine Garrett, > > just make sure > > the 4K pool is large enough. > > I take it then that the hardware works in the traditional way, and > just keeps on using buffers until the packet is completely written, > then sets a field on the ring descriptor saying "the end of the packet > is HERE"? > > I'll give that change a try when I get a chance. > > -GAWollman > >
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