id = 719
title = "live migration's performance with compression enabled is much worse than compression disabled"
state = "closed"
created_at = "2021-11-11T14:30:54.128Z"
closed_at = "2021-11-16T10:30:04.593Z"
labels = ["Migration"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/719"
host-os = "SLE15"
host-arch = "X86"
qemu-version = "QEMU emulator version 6.1.50 (v6.1.0-2205-g63ed851de4-dirty"
guest-os = "openSUSE-15.3"
guest-arch = "x86"
description = """"""
reproduce = """1. Run QEMU the Guests with 1Gpbs network on source host and destination host with QEMU command line
2. Run some memory work loads on Guest, for example, ./memtester 1G 1
3. Set migration parameters in QEMU monitor. On source and destination, 
   execute: #migrate_set_capability compress on
   Other compression parameters are all default. 
4. Run migrate command, # migrate -d tcp:10.156.208.154:4000
5. The results: 
   - without compression：  total time:  197366 ms   throughput:   937.81 mbps  transferred Ram: 22593703 kbytes 
   - with compression: total time:  281711 ms   throughput:  90.24 mbps    transferred Ram: 3102898 kbytes  

When compression is enabled, the compression transferred ram is reduced a lot. But the throughput is down badly.
The total time of live migration with compression is longer than without compression. 
I tried with 100G network bandwidth, it also has the same problem."""
additional = """"""