> Am 11.02.2012 00:25, schrieb Paul Brook: > >> ii) Some tracing of mine indicates QEMU has a highly dynamic memory > >> usage during runtime, be it due to network layer, block layer or > >> whatever exactly. > > > > We do? Significant compared to the size of guest ram? That sounds like a > > bug. > > Attached is a gnuplot from a simpletrace trace file while installing a > SLES 11 SP2 Release Candidate over slirp to virtio with -m 8G on an 8 > GiB host (post-1.0 master). > > It's not fully scientifically correct (it doesn't take into account > memory allocations not traced by QEMU itself, like pthreads) but it > suggests that after the initial surge to ~8.7 GB we have a fluctuation > of ~0.2 GB for 8 GiB guest RAM. It's larger than I'd expect at least. > > Since the user was close to the limit, this lead to an abort. In their > case it was a pthread_create() that failed, and we used tap + virtio.
Hmm, yes, we're clearly allocating some very large buffers somewhere. Paul
