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[Xen-bugs] [Bug 555] New: Using more than 3 vifs in linux guest causes c

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Subject:	[Xen-bugs] [Bug 555] New: Using more than 3 vifs in linux guest causes crash during boot
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Date:	Sun, 05 Mar 2006 22:09:33 +0000
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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=555

           Summary: Using more than 3 vifs in linux guest causes crash
                    during boot
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: martin.schaller@xxxxxx


When using more than 3 vifs in a linux guest, the kernel crashes during boot.
With the current settings it is probably impossible to use more than 3 vifs:
There are 2040 grant entries avaliable (NR_GRANT_FRAMES * PAGESIZE /
sizeof(grant_entry) - NR_RESERVED_ENTRIES).
Each vif reserves 256 + 256 (RX_RING_SIZE + TX_RING_SIZE) entries.
So there is only room for 3 vifs.

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