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xen-users
[Xen-users] vanilla linux, jumbo frames
On Tue, 18 Mar 2008, Tom Brown wrote:
Isn't these 100 mbps or 1000 mbps speeds funny numbers for today's CPU
power? I mean, somewhere in the design, there's something wrong that
forces
us to make possibly too many context switches between DomU, Hypervisor and
Dom0. ???
Emre
what, something like the 1500 byte maximum transmission unit (MTU) from back
in the days when 10 MILLION bits per second was so insanely fast we connected
everything to the same cable!? (remember 1200 baud modems?) Yes, there might
be some "design" decisions that don't work all that well today.
AFAIK, XEN can't do oversize (jumbo) frames, that would be a big help for a
lot of things (iSCSI, ATAoE, local network )... but even so, AFAIK it would
only be a relatively small improvement (jumbo frames only going up to about
8k AFAIK).
-Tom
My bad, As Pasi pointed out, it turns out that XEN has supported jumbo
frames since at least 3.0.4 ... of course, the AOE initiator support that
actually uses it seems to not be available until kernels 2.6.19 ... which
is too current for centos 5.1
so now I'm trying to boot 2.6.24.3 as a 32 PV guest on a 64 bit
hypervisor, and it's dieing at
Checking if this processor honours the WP bit even in supervisor mode... Ok.
installing Xen timer for CPU 0
------------[ cut here ]------------
kernel BUG at arch/x86/xen/time.c:122!
invalid opcode: 0000 [#1] SMP
time.c 122 is the BUG line in the snippet below...
static void setup_runstate_info(int cpu)
{
struct vcpu_register_runstate_memory_area area;
area.addr.v = &per_cpu(runstate, cpu);
if (HYPERVISOR_vcpu_op(VCPUOP_register_runstate_memory_area,
cpu, &area))
BUG();
}
Is this 32 bit on 64 bit hypervisor supposed to work for vanilla linux?
-Tom
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