Re: [Qemu-devel] Qemu and heavily increased RSS usage

[Peter Lieven <pl@kamp.de>]

Am 21.06.2016 um 15:18 schrieb Dr. David Alan Gilbert:
> * Peter Lieven (pl@kamp.de) wrote:
>> Hi,
>>
>> while upgrading from Qemu 2.2.0 to Qemu 2.5.1.1 I noticed that the RSS memory usage has heavily increased.
>> We use hugepages so the RSS memory does not include VM memory. In Qemu 2.2.0 it used to be ~30MB per vServer
>> and increased to up to 300 - 400MB for Qemu 2.5.1.1 (same with master). The memory increases over time, but seems
>> not to grow indefinetly. I tried to bisect, but had no result so far that made sense. I also tried valgrind / massif, but
>> valgrind does not see the allocation (at least at exit) and massif fails to rund due to - so it pretends - heap corruption.
>>
>> Any help or ideas how to debug further would be appreciated.
> I think I'd try stripping devices off; can you get a similar difference
> to happen with a guest with no USB, no hugepages, no VGA and a simple
> locally stored IDE disk?

 From what I have debugged so far, it seems to be related to virtio-net. With that knowledge I will try to bisect again.

Peter