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Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory
From: |
Peter Lieven |
Subject: |
Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory |
Date: |
Wed, 04 Jan 2012 15:21:56 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110921 Thunderbird/3.1.15 |
On 04.01.2012 15:14, Paolo Bonzini wrote:
On 01/04/2012 02:08 PM, Peter Lieven wrote:
thus my only option at the moment is to limit the runtime of the while
loop in stage 2 or
are there any post 1.0 patches in git that might already help?
No; even though (as I said) people are aware of the problems and do
plan to fix them, don't hold your breath. :(
ok, just for the record. if someone wants the time limit patch for the
while loop in stage 2 (which solves the problem
for me) and after some tweaking is able to provide a throughput of
approx. 450MB/s in my case, i attached it.
it also solves the case that due to a lot of dups the rate_limit does
not kick in and end the while loop.
--- qemu-kvm-1.0/arch_init.c.orig 2012-01-04 14:21:02.000000000 +0100
+++ qemu-kvm-1.0/arch_init.c 2012-01-04 14:27:34.000000000 +0100
@@ -301,6 +301,8 @@
bytes_transferred_last = bytes_transferred;
bwidth = qemu_get_clock_ns(rt_clock);
+ int pages_read = 0;
+
while ((ret = qemu_file_rate_limit(f)) == 0) {
int bytes_sent;
@@ -309,6 +311,11 @@
if (bytes_sent == 0) { /* no more blocks */
break;
}
+ if (!(++pages_read & 0xff)) {
+ if ((qemu_get_clock_ns(rt_clock) - bwidth) >
migrate_max_downtime())
+ break; /* we have spent more than allowed downtime in this
iteration */
+ }
}
if (ret < 0) {
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, (continued)
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Peter Lieven, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Peter Lieven, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Paolo Bonzini, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Peter Lieven, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Paolo Bonzini, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Peter Lieven, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Paolo Bonzini, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Peter Lieven, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Paolo Bonzini, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory, Peter Lieven, 2012/01/04
- Re: [Qemu-devel] Stalls on Live Migration of VMs with a lot of memory,
Peter Lieven <=