[Xen-devel] xen-unstable: TX/RX ring buffer exhaustion and NR_GRANT_FRAMES

[Birger Toedtmann <btoedtmann@xxxxxxxxxxxxxx>]

Hi,

it seems as if it is not possible to have more than 3 nics per domU
right now.  If I specify more, I get the usual

  [...]
  xen_net: Initialising virtual ethernet driver.
  #### netfront can't alloc rx grant refs
  vif: probe of vif-3 failed with error -12
  [...]

message - see bug #183.  It was pointed out to me that it might be
possible to adjust this manually in xen/include/xen/grant_table.h,
however, setting ORDER_GRANT_FRAMES to 3 to get more pages of grant
tables doesn't change anything.  Sooo, question #1: how can I alter the
code to get more grant tables such that more nics per domU will become
available?  Question #2: is it planned to make this configurable, e.g.
by boot option for dom0?


Regards,
-- 
Birger Tödtmann                   email:btoedtmann@xxxxxxxxxxxxxx
Technik der Rechnernetze, Institut für Experimentelle Mathematik
Universität Duisburg-Essen, Campus Essen, Germany.
skype:birger.toedtmann  pgp:0x6FB166C9  phone: +49-(0)201-1837662

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