Re: [MirageOS-devel] Memory exhaustion in Mirage

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

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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