kvm (qemu) speed virtio

[XliN]

Good day. Very little speed drives Virtio. Drivers are the latest guest 
on the system "Windows server 2008". Host system centos 6.5.


All that can be tried, but failed to increase the speed. And there I 
have a database running.


Screenshots test speed drives

http://itmages.ru/image/view/1471772/feec35c3 

http://itmages.ru/image/view/1471774/2b0baeae 

http://itmages.ru/image/view/1471785/9fffb8f5 



Thanks in advance. Apply nowhere else.
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Re: kvm (qemu) speed virtio

[XliN]

04.02.2014 20:32, Marcus пишет:

We may have seen this as well. Initial speed tests were actually
pretty good, but after running a few IO test it would actually cause
the physical disks that were dedicated to the windows vm host side to
be stuck at 100% util with no throughput for 30 seconds at a time
according to iostat. We were using noop scheduler on the disks. I
think it's something with your host, as we stopped seeing it when we
moved from stock CentOS 6.5 kernel to vanilla 3.10 kernel. Sorry I
don't have more info on the cause, we saw the issue for a few days but
were already upgrading due to the need for vxlan, so we didn't bother
investigating.

On Tue, Feb 4, 2014 at 7:22 AM, XliN  wrote:

Good day. Very little speed drives Virtio. Drivers are the latest guest on
the system "Windows server 2008". Host system centos 6.5.

All that can be tried, but failed to increase the speed. And there I have a
database running.

Screenshots test speed drives

http://itmages.ru/image/view/1471772/feec35c3
<http://itmages.ru/image/view/1471772/feec35c3>
http://itmages.ru/image/view/1471774/2b0baeae
<http://itmages.ru/image/view/1471774/2b0baeae>
http://itmages.ru/image/view/1471785/9fffb8f5
<http://itmages.ru/image/view/1471785/9fffb8f5>

Thanks in advance. Apply nowhere else.
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Offer a kernel upgrade to 3.10 on centos 6.5? Whether it will survive 
the host system? =)

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Re: [Qemu-devel] Speed disk virtio

[XliN]

08.02.2014 03:55, Brian Jackson пишет:

What latest? There are a few different places to get drivers (Fedora
site, RHEL subscription, build yourself, etc). From the graphs, it looks
like the speed isn't too bad at times. But it's hard to tell with the
information you've given about your particular config. I mean 50MB/s
isn't bad for a single rotating disk on raw storage. But we don't know
what kind of setup you have since you didn't tell us.
What data you want from me? Tell me and I will give. I just started 
learning about this virtualization and please write more.


Drivers download 
http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/


All images of guest systems are in folders in a file raw format. Centos 
host on LVM


Settings made ​​only

[root@micro ~]# cat /etc/sysctl.conf
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

#
vm.dirty_expire_centisecs = 3000
vm.dirty_background_ratio = 5
vm.dirty_ratio = 15
vm.swappiness = 100

#


# Controls the default maxmimum size of a mesage queue
kernel.msgmnb = 65536

# Controls the maximum size of a message, in bytes
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296



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