Re: [MirageOS-devel] Memory exhaustion in Mirage

[Richard Mortier <Richard.Mortier@xxxxxxxxxxxxxxxx>]

to check-- that's flood ping from a standard ping on linux hitting a unikernel, 
rather than flood pinging from within a unikernel to something else, correct?

(don't know if it's significant but might help masoud in tracking down his 
issue.)

On 17 Dec 2014, at 11:32, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:

> And just to confirm that we have no packet loss, I left parallel ping floods 
> running for a day.  The variance is due to the GC compactions:
> 
> 478535022 packets transmitted, 478535022 received, 0% packet loss, time 
> 42469559ms
> rtt min/avg/max/mdev = 0.025/0.051/5.549/0.073 ms, ipg/ewma 0.088/0.065 ms
> 
> -anil
> 
>> On 16 Dec 2014, at 15:59, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
>> 
>> If you're running short of memory on 2GB, that indicates that there's a 
>> large amount of buffering going on.  Are you seeing packet loss as a result?
>> 
>> Please do make a note on the bug report that you're seeing this, and what 
>> the trigger conditions are.  If you have a simple mirage-skeleton example of 
>> an Ethernet port flood that causes this, then that'll help fix it.
>> 
>> -anil
>> 
>>> On 16 Dec 2014, at 15:57, Masoud Koleini <masoud.koleini@xxxxxxxxxxxxxxxx> 
>>> wrote:
>>> 
>>> Yes, I have faced this problem several times when flooding the input port 
>>> (similar error on the console). The allocated memory for the switch is 2GB, 
>>> which is much higher than 64MB, but I guess bit rate should be higher too.
>>> 
>>> On 16/12/14 23:45, Anil Madhavapeddy wrote:
>>>> On 16 Dec 2014, at 15:23, Masoud Koleini <masoud.koleini@xxxxxxxxxxxxxxxx> 
>>>> wrote:
>>>>> I am wondering if the following issue is already addressed:
>>>>> 
>>>>> https://github.com/mirage/mirage-tcpip/issues/33
>>>>> 
>>>>> https://lists.cam.ac.uk/pipermail/cl-mirage/2013-August/msg00104.html
>>>>> 
>>>> It probably still happens at 64MB of RAM -- it requires some code to adjust
>>>> the GC parameters in the OCaml runtime to trigger a collection more often.
>>>> It should be harmless however, since (as the bug report observes), a 
>>>> failure
>>>> to allocate an Io_page results in a GC compaction that frees up memory so
>>>> that the allocation eventually succeeds.
>>>> 
>>>> Any particular reason for asking -- is the bug affecting your switch 
>>>> somehow?
>>>> 
>>>> -anil
>>> 
>>> 
>>> 
>>> 
>>> 
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-- 
Cheers,

R.

[ This address fails on Dec31. Use richard.mortier@xxxxxxxxxxxx subsequently. ]







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