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

From: Peter Lieven
Subject: Re: [Qemu-devel] Qemu and heavily increased RSS usage
Date: Thu, 23 Jun 2016 11:57:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

Am 21.06.2016 um 15:18 schrieb Dr. David Alan Gilbert:
* Peter Lieven (address@hidden) wrote:

while upgrading from Qemu 2.2.0 to Qemu 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 (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.


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