Messages in this thread | | | Subject | RE: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCPportsfrom the host TCP port space. | Date | Sun, 19 Aug 2007 18:45:24 -0700 | From | "Felix Marti" <> |
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> -----Original Message----- > From: ak@suse.de [mailto:ak@suse.de] On Behalf Of Andi Kleen > Sent: Sunday, August 19, 2007 4:28 PM > To: Felix Marti > Cc: David Miller; jeff@garzik.org; netdev@vger.kernel.org; > rdreier@cisco.com; linux-kernel@vger.kernel.org; > general@lists.openfabrics.org > Subject: Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate > PS_TCPportsfrom the host TCP port space. > > "Felix Marti" <felix@chelsio.com> writes: > > > what benefits does the TSO infrastructure give the > > non-TSO capable devices? > > It improves performance on software queueing devices between guests > and hypervisors. This is a more and more important application these > days. Even when the system running the Hypervisor has a non TSO > capable device in the end it'll still save CPU cycles this way. Right > now > virtualized IO tends to much more CPU intensive than direct IO so any > help it can get is beneficial. > > It also makes loopback faster, although given that's probably not that > useful. > > And a lot of the "TSO infrastructure" was needed for zero copy TX > anyways, > which benefits most reasonable modern NICs (anything with hardware > checksumming) Hi Andi, yes, you're right. I should have chosen my example more carefully.
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