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Re: [MirageOS-devel] Memory exhaustion in Mirage

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 
rtt min/avg/max/mdev = 0.025/0.051/5.549/0.073 ms, ipg/ewma 0.088/0.065 ms


> 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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