Re: [ceph-users] Theory: High I/O-wait inside VM with RBD due to CPU throttling

2019-08-26 Thread Jason Dillaman
On Mon, Aug 26, 2019 at 5:01 AM Wido den Hollander wrote: > > > > On 8/22/19 5:49 PM, Jason Dillaman wrote: > > On Thu, Aug 22, 2019 at 11:29 AM Wido den Hollander wrote: > >> > >> > >> > >> On 8/22/19 3:59 PM, Jason Dillaman wrote: > >>> On Thu, Aug 22, 2019 at 9:23 AM Wido den Hollander

Re: [ceph-users] Theory: High I/O-wait inside VM with RBD due to CPU throttling

2019-08-26 Thread Wido den Hollander
On 8/22/19 5:49 PM, Jason Dillaman wrote: > On Thu, Aug 22, 2019 at 11:29 AM Wido den Hollander wrote: >> >> >> >> On 8/22/19 3:59 PM, Jason Dillaman wrote: >>> On Thu, Aug 22, 2019 at 9:23 AM Wido den Hollander wrote: Hi, In a couple of situations I have encountered that

Re: [ceph-users] Theory: High I/O-wait inside VM with RBD due to CPU throttling

2019-08-22 Thread Jason Dillaman
On Thu, Aug 22, 2019 at 11:29 AM Wido den Hollander wrote: > > > > On 8/22/19 3:59 PM, Jason Dillaman wrote: > > On Thu, Aug 22, 2019 at 9:23 AM Wido den Hollander wrote: > >> > >> Hi, > >> > >> In a couple of situations I have encountered that Virtual Machines > >> running on RBD had a high

Re: [ceph-users] Theory: High I/O-wait inside VM with RBD due to CPU throttling

2019-08-22 Thread Wido den Hollander
On 8/22/19 3:59 PM, Jason Dillaman wrote: > On Thu, Aug 22, 2019 at 9:23 AM Wido den Hollander wrote: >> >> Hi, >> >> In a couple of situations I have encountered that Virtual Machines >> running on RBD had a high I/O-wait, nearly 100%, on their vdX (VirtIO) >> or sdX (Virtio-SCSI) devices

Re: [ceph-users] Theory: High I/O-wait inside VM with RBD due to CPU throttling

2019-08-22 Thread Jason Dillaman
On Thu, Aug 22, 2019 at 9:23 AM Wido den Hollander wrote: > > Hi, > > In a couple of situations I have encountered that Virtual Machines > running on RBD had a high I/O-wait, nearly 100%, on their vdX (VirtIO) > or sdX (Virtio-SCSI) devices while they were performing CPU intensive tasks. > >

[ceph-users] Theory: High I/O-wait inside VM with RBD due to CPU throttling

2019-08-22 Thread Wido den Hollander
Hi, In a couple of situations I have encountered that Virtual Machines running on RBD had a high I/O-wait, nearly 100%, on their vdX (VirtIO) or sdX (Virtio-SCSI) devices while they were performing CPU intensive tasks. These servers would be running a very CPU intensive application while *not*