Re: [MirageOS-devel] wireshark capture of failed download from mirage-www on ARM

[Thomas Leonard <talex5@xxxxxxxxx>]

On 22 July 2014 09:14, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
> On 22 Jul 2014, at 01:10, Thomas Leonard <talex5@xxxxxxxxx> wrote:
>>
>> I noticed I'm getting a lot of these in the dom0 log (dmsg):
>>
>> Jul 22 08:09:05 cubietruck kernel: [11892.128241]
>> xen_add_phys_to_mach_entry: cannot add pfn=0x00079abe ->
>> mfn=0x000bed87: pfn=0x000799a6 -> mfn=0x000bed87 already exists
>> Jul 22 08:09:05 cubietruck kernel: [11892.128727]
>> xen_add_mach_to_phys_entry: cannot add pfn=0x00079bcb ->
>> mfn=0x000bed87: pfn=0x000799a6 -> mfn=0x000bed87 already exists
>> Jul 22 08:09:05 cubietruck kernel: [11892.133264]
>> xen_add_phys_to_mach_entry: cannot add pfn=0x00079b70 ->
>> mfn=0x000bed87: pfn=0x00079bd7 -> mfn=0x000bed87 already exists
>> Jul 22 08:09:09 cubietruck kernel: [11896.041106]
>> xen_add_phys_to_mach_entry: cannot add pfn=0x0007999a ->
>> mfn=0x000bed87: pfn=0x00079b2b -> mfn=0x000bed87 already exists
>
> That looks like this bug in Xen/ARM/netback:
> http://lists.xenproject.org/archives/html/xen-users/2014-07/msg00067.html

Aha! This seems to fix it (I can browse mirage-www without huge delays):

diff --git a/lib/netif.ml b/lib/netif.ml
index 4e02e5e..3cc7760 100644
--- a/lib/netif.ml
+++ b/lib/netif.ml
@@ -455,7 +455,7 @@ let writev nf pages =
          lwt rest_th = xmit other_pages in
          (* All fragments are now written, we can now notify the backend *)
          Lwt_ring.Front.push nf.t.tx_client (notify nf.t);
-         return ()
+         join rest_th
     )

 let wait_for_plug nf =

Not very efficient, but at least it works! Looks like the Xen people
will fix it at some point.


-- 
Dr Thomas Leonard        http://0install.net/
GPG: 9242 9807 C985 3C07 44A6  8B9A AE07 8280 59A5 3CC1
GPG: DA98 25AE CAD0 8975 7CDA  BD8E 0713 3F96 CA74 D8BA

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