[Qemu-devel] Speed disk virtio

[Qemu-devel] Speed disk virtio

[XliN]

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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: [Qemu-devel] Speed disk virtio

[Brian Jackson]

On 02/04/2014 08:21 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.


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.


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


All? You should try being specific about what you've tried. How you are
running the guest. The underlying hardware. Command line options. Too
much detail is better than none (which is about what you've given us).


>
> 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.


I'm not really sure what this test that you've run is. For all I know,
your results look spectacular.

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