Re: RX error (microkernel in EC2)

[William Le Ferrand <warnegia@xxxxxxxxx>]

ok great. fyi I'm doing consulting work for someone who is storing & indexing > 8 Tb/day in AWS and looking to scale to 250 Tb/day. It's full scala, but I'd love to benchmark a mirage-based solution on my spare time and to push them in this direction if the figures make sense

On Thu, Sep 19, 2013 at 6:59 AM, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:

DHCP should work too (and has worked in the past, so this is no doubt a minor issue, despite being difficult to debug).

-anil

On 19 Sep 2013, at 14:56, William Le Ferrand <warnegia@xxxxxxxxx> wrote:

I used the ec2.sh script, but I think that I was on the wrong track anyway as local IP should be retrieved from the instance using "GET http://169.254.169.254/latest/meta-data/local-ipv4"Ârather than DHCP, shouldn't it? That's why I inquired about the status of client functions in cohttp

On Thu, Sep 19, 2013 at 3:57 AM, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:

I'll take a look at this -- which script did you use to wrap up the EC2 kernel for upload William? (just curious if you've been using the AWS OCaml bindings for this, or doing it manually)

-anil

On 18 Sep 2013, at 23:57, William Le Ferrand <warnegia@xxxxxxxxx> wrote:

Yes, I tried that but the error only occurs in EC2; it's raised somewhere in the DHCP module it seems ..

On Wed, Sep 18, 2013 at 2:12 PM, David Scott <scott.dj@xxxxxxxxx> wrote:

Hi,

I usually start by recompiling the app as a Unix process (using "mirage-unix" rather than "mirage-xen"). Assuming the bug manifests there (probably: I suspect the String.sub problem is coming from the http-level rather than the xen driver-level) then you can use regular debugging tools, set OCAMLRUNPARAM=b etc.

Debugging in-situ on EC2 is currently a matter of inserting printf's and reading the code-- not ideal.

HTH

Dave

On Wed, Sep 18, 2013 at 9:45 PM, William Le Ferrand <warnegia@xxxxxxxxx> wrote:

hello everyone

I'm running the simplest cohttp application possible in EC2, the instance boots but quickly complains :Â

MAC: 0e:32:89:f8:03:7b
 sg:true gso_tcpv4:true rx_copy:true rx_flip:false smart_poll:false
Manager: plug 0
Manager: plug done, to listener
Manager: Interface 0 to DHCP
DHCP: waiting for first offer
Manager: init done
DHCP: start discovery
Sending DHCP broadcast len 552
DHCP: start discovery
Sending DHCP broadcast len 552
DHCP: input ciaddr 0.0.0.0 yiaddr 172.31.23.46 siaddr 0.0.0.0 giaddr 0.0.0.0 chaddr  2ïï { sname  file 
DHCP: offer received: 172.31.23.46
Sending DHCP broadcast len 552
RX exn Invalid_argument("String.sub")

Am I doing something wrong somewhere and what would be a good strategy to debug this?Â

Thanks

williamÂ

--
William Le Ferrand

Mobile :Â(+1)Â(415) 683-1484

Web :Âhttp://williamleferrand.github.com/

--
Dave Scott

--
William Le Ferrand

Mobile :Â(+1)Â(415) 683-1484

Web :Âhttp://williamleferrand.github.com/

--
William Le Ferrand

Mobile :Â(+1)Â(415) 683-1484

Web :Âhttp://williamleferrand.github.com/

--
William Le Ferrand

Mobile :Â(+1)Â(415) 683-1484

Web :Âhttp://williamleferrand.github.com/