On Thu, Jul 11, 2013 at 10:43 AM, Ben Pfaff <b...@nicira.com> wrote:
> On Thu, Jul 11, 2013 at 10:39:38AM -0700, Gurucharan Shetty wrote: > > On Thu, Jul 11, 2013 at 10:34 AM, Gurucharan Shetty <shet...@nicira.com > >wrote: > > > > > On Thu, Jul 11, 2013 at 10:22 AM, Ben Pfaff <b...@nicira.com> wrote: > > > > > >> On Thu, Jul 11, 2013 at 09:37:45AM -0700, Gurucharan Shetty wrote: > > >> > Signed-off-by: Gurucharan Shetty <gshe...@nicira.com> > > >> > > >> I'm not sure it's worth mentioning the 65,280 port limit, because it's > > >> about the same as the maximum number of file descriptors. > > >> > > >> At first thought, these limits seemed Linux specific, but I think that > > >> FreeBSD also needs a file descriptor per port (for a pcap handle), so > > >> maybe it's not worth saying that it is Linux specific. The final note > > >> about performance beyond 1,024 ports is definitely specific to the > > >> Linux kernel datapath though. > > >> > > > Okay. How about the following wording? > > > > > > ovs-vswitchd started through ovs-ctl provides a limit of 5000 file > > > descriptors. Creation of a single bridge consumes 3 file descriptors > and > > > adding a port consumes 1 file descriptor. The limits on the number of > > > bridges and ports is decided by the availability of file descriptors. > (For > > > Linux kernel datapath, performance will degrade beyond 1,024 ports per > > > bridge due to fixed hash table sizing.) > > > > > Or probably make the entire thing Linux specific. > > ovs-vswitchd started through ovs-ctl provides a limit of 5000 file > > descriptors. The limits on the number of bridges and ports is decided by > > the availability of file descriptors. On Linux, creation of a single > bridge > > consumes 3 file descriptors and adding a port consumes 1 file descriptor. > > Performance will degrade beyond 1,024 ports per bridge due to fixed hash > > table sizing. Other platforms may have different limitations. > > How about "With the Linux kernel datapath" instead of "On Linux", > because the netdev datapath has slightly different characteristics. > Otherwise I like this. > Sounds good. I applied it and pushed this series to master and 1.11. Thanks for the reviews.
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