[Qemu-devel] Virtio-9p and cgroup io-throttling

[Qemu-devel] Virtio-9p and cgroup io-throttling

[Pradeep Kiruvale]

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Hi All,

I am using virtio-9p for sharing the file between host and guest. To test
the shared file I do read/write options in the guest.To have controlled io,
I am using cgroup blkio.

While using cgroup I am facing two issues,Please find the issues below.

1. When I do IO throttling using the cgroup the read throttling works fine
but the write throttling does not wok. It still bypasses these throttling
control and does the default, am I missing something here?

I use the following commands to create VM, share the files and to
read/write from guest.

*Create vm*
qemu-system-x86_64 -balloon none .......-name vm0 -cpu host -m 128 -smp 1
-enable-kvm -parallel .... -fsdev
local,id=sdb1,path=/mnt/sdb1,security_model=none,writeout=immediate -device
virtio-9p-pci,fsdev=sdb1,mount_tag=sdb1

*Mount file*
mount -t 9p -o trans=virtio,version=9p2000.L sdb1 /sdb1_ext4 2>>dd.log &&
sync

touch /sdb1_ext4/dddrive

*Write test*
dd if=/dev/zero of=/sdb1_ext4/dddrive bs=4k count=800000 oflag=direct >>
dd.log 2>&1 && sync

*Read test*
dd if=/sdb1_ext4/dddrive of=/dev/null >> dd.log 2>&1 && sync

2. The other issue is when I run "dd" command inside guest  it creates
multiple threads to write/read. I can see those on host using iotop is this
expected behavior?

Regards,
Pradeep

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Re: [Qemu-devel] Virtio-9p and cgroup io-throttling

[Greg Kurz]

On Thu, 7 Apr 2016 11:48:27 +0200
Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:

> Hi All,
> 
> I am using virtio-9p for sharing the file between host and guest. To test
> the shared file I do read/write options in the guest.To have controlled io,
> I am using cgroup blkio.
> 
> While using cgroup I am facing two issues,Please find the issues below.
> 
> 1. When I do IO throttling using the cgroup the read throttling works fine
> but the write throttling does not wok. It still bypasses these throttling
> control and does the default, am I missing something here?
> 

Hi,

Can you provide details on your blkio setup ?

> I use the following commands to create VM, share the files and to
> read/write from guest.
> 
> *Create vm*
> qemu-system-x86_64 -balloon none .......-name vm0 -cpu host -m 128 -smp 1
> -enable-kvm -parallel .... -fsdev
> local,id=sdb1,path=/mnt/sdb1,security_model=none,writeout=immediate -device
> virtio-9p-pci,fsdev=sdb1,mount_tag=sdb1
> 
> *Mount file*
> mount -t 9p -o trans=virtio,version=9p2000.L sdb1 /sdb1_ext4 2>>dd.log &&
> sync
> 
> touch /sdb1_ext4/dddrive
> 
> *Write test*
> dd if=/dev/zero of=/sdb1_ext4/dddrive bs=4k count=800000 oflag=direct >>
> dd.log 2>&1 && sync
> 
> *Read test*
> dd if=/sdb1_ext4/dddrive of=/dev/null >> dd.log 2>&1 && sync
> 
> 2. The other issue is when I run "dd" command inside guest  it creates
> multiple threads to write/read. I can see those on host using iotop is this
> expected behavior?
> 

Yes. QEMU uses a thread pool to handle 9p requests.

> Regards,
> Pradeep

Cheers.

--
Greg

Re: [Qemu-devel] Virtio-9p and cgroup io-throttling

[Pradeep Kiruvale]

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Hi Greg,

Thanks for your reply.

Below is the way how I add to blkio

echo "8:16 8388608" >
/sys/fs/cgroup/blkio/test/blkio.throttle.write_bps_device

The problem I guess is adding these task ids to the "tasks" file in cgroup

These threads are started randomly and even then I add the PIDs to the
tasks file the cgroup still does not do IO control.

Is it possible to reduce these number of threads? I see different number of
threads doing IO at different runs.

Regards,
Pradeep


On 8 April 2016 at 10:10, Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:

> On Thu, 7 Apr 2016 11:48:27 +0200
> Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:
>
> > Hi All,
> >
> > I am using virtio-9p for sharing the file between host and guest. To test
> > the shared file I do read/write options in the guest.To have controlled
> io,
> > I am using cgroup blkio.
> >
> > While using cgroup I am facing two issues,Please find the issues below.
> >
> > 1. When I do IO throttling using the cgroup the read throttling works
> fine
> > but the write throttling does not wok. It still bypasses these throttling
> > control and does the default, am I missing something here?
> >
>
> Hi,
>
> Can you provide details on your blkio setup ?
>
> > I use the following commands to create VM, share the files and to
> > read/write from guest.
> >
> > *Create vm*
> > qemu-system-x86_64 -balloon none .......-name vm0 -cpu host -m 128 -smp 1
> > -enable-kvm -parallel .... -fsdev
> > local,id=sdb1,path=/mnt/sdb1,security_model=none,writeout=immediate
> -device
> > virtio-9p-pci,fsdev=sdb1,mount_tag=sdb1
> >
> > *Mount file*
> > mount -t 9p -o trans=virtio,version=9p2000.L sdb1 /sdb1_ext4 2>>dd.log &&
> > sync
> >
> > touch /sdb1_ext4/dddrive
> >
> > *Write test*
> > dd if=/dev/zero of=/sdb1_ext4/dddrive bs=4k count=800000 oflag=direct >>
> > dd.log 2>&1 && sync
> >
> > *Read test*
> > dd if=/sdb1_ext4/dddrive of=/dev/null >> dd.log 2>&1 && sync
> >
> > 2. The other issue is when I run "dd" command inside guest  it creates
> > multiple threads to write/read. I can see those on host using iotop is
> this
> > expected behavior?
> >
>
> Yes. QEMU uses a thread pool to handle 9p requests.
>
> > Regards,
> > Pradeep
>
> Cheers.
>
> --
> Greg
>
>

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Re: [Qemu-devel] Virtio-9p and cgroup io-throttling

[Greg Kurz]

On Fri, 8 Apr 2016 11:51:05 +0200
Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:

> Hi Greg,
> 
> Thanks for your reply.
> 
> Below is the way how I add to blkio
> 
> echo "8:16 8388608" >
> /sys/fs/cgroup/blkio/test/blkio.throttle.write_bps_device
> 

Ok, this just puts a limit of 8MB/s when writing to /dev/sdb for all
tasks in the test cgroup... but what about the tasks themselves ?

> The problem I guess is adding these task ids to the "tasks" file in cgroup
> 

Exactly. :)

> These threads are started randomly and even then I add the PIDs to the
> tasks file the cgroup still does not do IO control.
> 

How did you get the PIDs ? Are you sure these threads you have added to the
cgroup are the ones that write to /dev/sdb ?

> Is it possible to reduce these number of threads? I see different number of
> threads doing IO at different runs.
> 

AFAIK, no.

Why don't you simply start QEMU in the cgroup ? Unless I miss something, all
children threads, including the 9p ones, will be in the cgroup and honor the
throttle setttings.

> Regards,
> Pradeep
> 

Cheers.

--
Greg

> 
> On 8 April 2016 at 10:10, Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> 
> > On Thu, 7 Apr 2016 11:48:27 +0200
> > Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:
> >
> > > Hi All,
> > >
> > > I am using virtio-9p for sharing the file between host and guest. To test
> > > the shared file I do read/write options in the guest.To have controlled
> > io,
> > > I am using cgroup blkio.
> > >
> > > While using cgroup I am facing two issues,Please find the issues below.
> > >
> > > 1. When I do IO throttling using the cgroup the read throttling works
> > fine
> > > but the write throttling does not wok. It still bypasses these throttling
> > > control and does the default, am I missing something here?
> > >
> >
> > Hi,
> >
> > Can you provide details on your blkio setup ?
> >
> > > I use the following commands to create VM, share the files and to
> > > read/write from guest.
> > >
> > > *Create vm*
> > > qemu-system-x86_64 -balloon none .......-name vm0 -cpu host -m 128 -smp 1
> > > -enable-kvm -parallel .... -fsdev
> > > local,id=sdb1,path=/mnt/sdb1,security_model=none,writeout=immediate
> > -device
> > > virtio-9p-pci,fsdev=sdb1,mount_tag=sdb1
> > >
> > > *Mount file*
> > > mount -t 9p -o trans=virtio,version=9p2000.L sdb1 /sdb1_ext4 2>>dd.log &&
> > > sync
> > >
> > > touch /sdb1_ext4/dddrive
> > >
> > > *Write test*
> > > dd if=/dev/zero of=/sdb1_ext4/dddrive bs=4k count=800000 oflag=direct >>
> > > dd.log 2>&1 && sync
> > >
> > > *Read test*
> > > dd if=/sdb1_ext4/dddrive of=/dev/null >> dd.log 2>&1 && sync
> > >
> > > 2. The other issue is when I run "dd" command inside guest  it creates
> > > multiple threads to write/read. I can see those on host using iotop is
> > this
> > > expected behavior?
> > >
> >
> > Yes. QEMU uses a thread pool to handle 9p requests.
> >
> > > Regards,
> > > Pradeep
> >
> > Cheers.
> >
> > --
> > Greg
> >
> >

Re: [Qemu-devel] Virtio-9p and cgroup io-throttling

[Pradeep Kiruvale]

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Hi Greg,

FInd my replies inline

>
> > Below is the way how I add to blkio
> >
> > echo "8:16 8388608" >
> > /sys/fs/cgroup/blkio/test/blkio.throttle.write_bps_device
> >
>
> Ok, this just puts a limit of 8MB/s when writing to /dev/sdb for all
> tasks in the test cgroup... but what about the tasks themselves ?
>
> > The problem I guess is adding these task ids to the "tasks" file in
> cgroup
> >
>
> Exactly. :)
>
> > These threads are started randomly and even then I add the PIDs to the
> > tasks file the cgroup still does not do IO control.
> >
>
> How did you get the PIDs ? Are you sure these threads you have added to the
> cgroup are the ones that write to /dev/sdb ?
>

*Yes, I get PIDs from /proc/Qemu_PID/task*



>
> > Is it possible to reduce these number of threads? I see different number
> of
> > threads doing IO at different runs.
> >
>
> AFAIK, no.
>
> Why don't you simply start QEMU in the cgroup ? Unless I miss something,
> all
> children threads, including the 9p ones, will be in the cgroup and honor
> the
> throttle setttings.
>


*I started the qemu with cgroup as below*

*cgexec -g blkio:/test qemu.......*
*Is there any other way of starting the qemu in cgroup?*

Regards,
Pradeep


>
> > Regards,
> > Pradeep
> >
>
> Cheers.
>
> --
> Greg
>
> >
> > On 8 April 2016 at 10:10, Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> >
> > > On Thu, 7 Apr 2016 11:48:27 +0200
> > > Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:
> > >
> > > > Hi All,
> > > >
> > > > I am using virtio-9p for sharing the file between host and guest. To
> test
> > > > the shared file I do read/write options in the guest.To have
> controlled
> > > io,
> > > > I am using cgroup blkio.
> > > >
> > > > While using cgroup I am facing two issues,Please find the issues
> below.
> > > >
> > > > 1. When I do IO throttling using the cgroup the read throttling works
> > > fine
> > > > but the write throttling does not wok. It still bypasses these
> throttling
> > > > control and does the default, am I missing something here?
> > > >
> > >
> > > Hi,
> > >
> > > Can you provide details on your blkio setup ?
> > >
> > > > I use the following commands to create VM, share the files and to
> > > > read/write from guest.
> > > >
> > > > *Create vm*
> > > > qemu-system-x86_64 -balloon none .......-name vm0 -cpu host -m 128
> -smp 1
> > > > -enable-kvm -parallel .... -fsdev
> > > > local,id=sdb1,path=/mnt/sdb1,security_model=none,writeout=immediate
> > > -device
> > > > virtio-9p-pci,fsdev=sdb1,mount_tag=sdb1
> > > >
> > > > *Mount file*
> > > > mount -t 9p -o trans=virtio,version=9p2000.L sdb1 /sdb1_ext4
> 2>>dd.log &&
> > > > sync
> > > >
> > > > touch /sdb1_ext4/dddrive
> > > >
> > > > *Write test*
> > > > dd if=/dev/zero of=/sdb1_ext4/dddrive bs=4k count=800000
> oflag=direct >>
> > > > dd.log 2>&1 && sync
> > > >
> > > > *Read test*
> > > > dd if=/sdb1_ext4/dddrive of=/dev/null >> dd.log 2>&1 && sync
> > > >
> > > > 2. The other issue is when I run "dd" command inside guest  it
> creates
> > > > multiple threads to write/read. I can see those on host using iotop
> is
> > > this
> > > > expected behavior?
> > > >
> > >
> > > Yes. QEMU uses a thread pool to handle 9p requests.
> > >
> > > > Regards,
> > > > Pradeep
> > >
> > > Cheers.
> > >
> > > --
> > > Greg
> > >
> > >
>
>

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Re: [Qemu-devel] Virtio-9p and cgroup io-throttling

[Greg Kurz]

On Fri, 8 Apr 2016 14:55:29 +0200
Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:

> Hi Greg,
> 
> FInd my replies inline
> 
> >
> > > Below is the way how I add to blkio
> > >
> > > echo "8:16 8388608" >
> > > /sys/fs/cgroup/blkio/test/blkio.throttle.write_bps_device
> > >
> >
> > Ok, this just puts a limit of 8MB/s when writing to /dev/sdb for all
> > tasks in the test cgroup... but what about the tasks themselves ?
> >
> > > The problem I guess is adding these task ids to the "tasks" file in
> > cgroup
> > >
> >
> > Exactly. :)
> >
> > > These threads are started randomly and even then I add the PIDs to the
> > > tasks file the cgroup still does not do IO control.
> > >
> >
> > How did you get the PIDs ? Are you sure these threads you have added to the
> > cgroup are the ones that write to /dev/sdb ?
> >
> 
> *Yes, I get PIDs from /proc/Qemu_PID/task*
> 

And then you echoed the PIDs to /sys/fs/cgroup/blkio/test/tasks ?

This is racy... another IO thread may be started to do some work on /dev/sdb
just after you've read PIDs from /proc/Qemu_PID/task, and it won't be part
of the cgroup.

> 
> 
> >
> > > Is it possible to reduce these number of threads? I see different number
> > of
> > > threads doing IO at different runs.
> > >
> >
> > AFAIK, no.
> >
> > Why don't you simply start QEMU in the cgroup ? Unless I miss something,
> > all
> > children threads, including the 9p ones, will be in the cgroup and honor
> > the
> > throttle setttings.
> >
> 
> 
> *I started the qemu with cgroup as below*
> 
> *cgexec -g blkio:/test qemu.......*
> *Is there any other way of starting the qemu in cgroup?*
> 

Maybe you can pass --sticky to cgexec to prevent cgred from moving
children tasks to other cgroups...

There's also the old fashion method:

# echo $$ > /sys/fs/cgroup/blkio/test/tasks
# qemu.....

This being said, QEMU is a regular userspace program that is completely cgroup
agnostic. It won't behave differently than 'dd if=/dev/sdb of=/dev/null'.

This really doesn't look like a QEMU related issue to me.

> Regards,
> Pradeep
> 

Cheers.

--
Greg

> 
> >
> > > Regards,
> > > Pradeep
> > >
> >
> > Cheers.
> >
> > --
> > Greg
> >
> > >
> > > On 8 April 2016 at 10:10, Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> > >
> > > > On Thu, 7 Apr 2016 11:48:27 +0200
> > > > Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:
> > > >
> > > > > Hi All,
> > > > >
> > > > > I am using virtio-9p for sharing the file between host and guest. To
> > test
> > > > > the shared file I do read/write options in the guest.To have
> > controlled
> > > > io,
> > > > > I am using cgroup blkio.
> > > > >
> > > > > While using cgroup I am facing two issues,Please find the issues
> > below.
> > > > >
> > > > > 1. When I do IO throttling using the cgroup the read throttling works
> > > > fine
> > > > > but the write throttling does not wok. It still bypasses these
> > throttling
> > > > > control and does the default, am I missing something here?
> > > > >
> > > >
> > > > Hi,
> > > >
> > > > Can you provide details on your blkio setup ?
> > > >
> > > > > I use the following commands to create VM, share the files and to
> > > > > read/write from guest.
> > > > >
> > > > > *Create vm*
> > > > > qemu-system-x86_64 -balloon none .......-name vm0 -cpu host -m 128
> > -smp 1
> > > > > -enable-kvm -parallel .... -fsdev
> > > > > local,id=sdb1,path=/mnt/sdb1,security_model=none,writeout=immediate
> > > > -device
> > > > > virtio-9p-pci,fsdev=sdb1,mount_tag=sdb1
> > > > >
> > > > > *Mount file*
> > > > > mount -t 9p -o trans=virtio,version=9p2000.L sdb1 /sdb1_ext4
> > 2>>dd.log &&
> > > > > sync
> > > > >
> > > > > touch /sdb1_ext4/dddrive
> > > > >
> > > > > *Write test*
> > > > > dd if=/dev/zero of=/sdb1_ext4/dddrive bs=4k count=800000
> > oflag=direct >>
> > > > > dd.log 2>&1 && sync
> > > > >
> > > > > *Read test*
> > > > > dd if=/sdb1_ext4/dddrive of=/dev/null >> dd.log 2>&1 && sync
> > > > >
> > > > > 2. The other issue is when I run "dd" command inside guest  it
> > creates
> > > > > multiple threads to write/read. I can see those on host using iotop
> > is
> > > > this
> > > > > expected behavior?
> > > > >
> > > >
> > > > Yes. QEMU uses a thread pool to handle 9p requests.
> > > >
> > > > > Regards,
> > > > > Pradeep
> > > >
> > > > Cheers.
> > > >
> > > > --
> > > > Greg
> > > >
> > > >
> >
> >

Re: [Qemu-devel] Virtio-9p and cgroup io-throttling

[Pradeep Kiruvale]

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Hi Greg,

Yes, it was nothing to do with the virtio-9p. I was writing at 4k Blocks
now I changed it to 1K Block. This works fine for me.

Thanks for your help.

Regards,
Pradeep

On 8 April 2016 at 16:58, Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:

> On Fri, 8 Apr 2016 14:55:29 +0200
> Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:
>
> > Hi Greg,
> >
> > FInd my replies inline
> >
> > >
> > > > Below is the way how I add to blkio
> > > >
> > > > echo "8:16 8388608" >
> > > > /sys/fs/cgroup/blkio/test/blkio.throttle.write_bps_device
> > > >
> > >
> > > Ok, this just puts a limit of 8MB/s when writing to /dev/sdb for all
> > > tasks in the test cgroup... but what about the tasks themselves ?
> > >
> > > > The problem I guess is adding these task ids to the "tasks" file in
> > > cgroup
> > > >
> > >
> > > Exactly. :)
> > >
> > > > These threads are started randomly and even then I add the PIDs to
> the
> > > > tasks file the cgroup still does not do IO control.
> > > >
> > >
> > > How did you get the PIDs ? Are you sure these threads you have added
> to the
> > > cgroup are the ones that write to /dev/sdb ?
> > >
> >
> > *Yes, I get PIDs from /proc/Qemu_PID/task*
> >
>
> And then you echoed the PIDs to /sys/fs/cgroup/blkio/test/tasks ?
>
> This is racy... another IO thread may be started to do some work on
> /dev/sdb
> just after you've read PIDs from /proc/Qemu_PID/task, and it won't be part
> of the cgroup.
>
> >
> >
> > >
> > > > Is it possible to reduce these number of threads? I see different
> number
> > > of
> > > > threads doing IO at different runs.
> > > >
> > >
> > > AFAIK, no.
> > >
> > > Why don't you simply start QEMU in the cgroup ? Unless I miss
> something,
> > > all
> > > children threads, including the 9p ones, will be in the cgroup and
> honor
> > > the
> > > throttle setttings.
> > >
> >
> >
> > *I started the qemu with cgroup as below*
> >
> > *cgexec -g blkio:/test qemu.......*
> > *Is there any other way of starting the qemu in cgroup?*
> >
>
> Maybe you can pass --sticky to cgexec to prevent cgred from moving
> children tasks to other cgroups...
>
> There's also the old fashion method:
>
> # echo $$ > /sys/fs/cgroup/blkio/test/tasks
> # qemu.....
>
> This being said, QEMU is a regular userspace program that is completely
> cgroup
> agnostic. It won't behave differently than 'dd if=/dev/sdb of=/dev/null'.
>
> This really doesn't look like a QEMU related issue to me.
>
> > Regards,
> > Pradeep
> >
>
> Cheers.
>
> --
> Greg
>
> >
> > >
> > > > Regards,
> > > > Pradeep
> > > >
> > >
> > > Cheers.
> > >
> > > --
> > > Greg
> > >
> > > >
> > > > On 8 April 2016 at 10:10, Greg Kurz <gkurz@linux.vnet.ibm.com>
> wrote:
> > > >
> > > > > On Thu, 7 Apr 2016 11:48:27 +0200
> > > > > Pradeep Kiruvale <pradeepkiruvale@gmail.com> wrote:
> > > > >
> > > > > > Hi All,
> > > > > >
> > > > > > I am using virtio-9p for sharing the file between host and
> guest. To
> > > test
> > > > > > the shared file I do read/write options in the guest.To have
> > > controlled
> > > > > io,
> > > > > > I am using cgroup blkio.
> > > > > >
> > > > > > While using cgroup I am facing two issues,Please find the issues
> > > below.
> > > > > >
> > > > > > 1. When I do IO throttling using the cgroup the read throttling
> works
> > > > > fine
> > > > > > but the write throttling does not wok. It still bypasses these
> > > throttling
> > > > > > control and does the default, am I missing something here?
> > > > > >
> > > > >
> > > > > Hi,
> > > > >
> > > > > Can you provide details on your blkio setup ?
> > > > >
> > > > > > I use the following commands to create VM, share the files and to
> > > > > > read/write from guest.
> > > > > >
> > > > > > *Create vm*
> > > > > > qemu-system-x86_64 -balloon none .......-name vm0 -cpu host -m
> 128
> > > -smp 1
> > > > > > -enable-kvm -parallel .... -fsdev
> > > > > >
> local,id=sdb1,path=/mnt/sdb1,security_model=none,writeout=immediate
> > > > > -device
> > > > > > virtio-9p-pci,fsdev=sdb1,mount_tag=sdb1
> > > > > >
> > > > > > *Mount file*
> > > > > > mount -t 9p -o trans=virtio,version=9p2000.L sdb1 /sdb1_ext4
> > > 2>>dd.log &&
> > > > > > sync
> > > > > >
> > > > > > touch /sdb1_ext4/dddrive
> > > > > >
> > > > > > *Write test*
> > > > > > dd if=/dev/zero of=/sdb1_ext4/dddrive bs=4k count=800000
> > > oflag=direct >>
> > > > > > dd.log 2>&1 && sync
> > > > > >
> > > > > > *Read test*
> > > > > > dd if=/sdb1_ext4/dddrive of=/dev/null >> dd.log 2>&1 && sync
> > > > > >
> > > > > > 2. The other issue is when I run "dd" command inside guest  it
> > > creates
> > > > > > multiple threads to write/read. I can see those on host using
> iotop
> > > is
> > > > > this
> > > > > > expected behavior?
> > > > > >
> > > > >
> > > > > Yes. QEMU uses a thread pool to handle 9p requests.
> > > > >
> > > > > > Regards,
> > > > > > Pradeep
> > > > >
> > > > > Cheers.
> > > > >
> > > > > --
> > > > > Greg
> > > > >
> > > > >
> > >
> > >
>
>
>

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