Hey, guys:
I'm running a batch of CoreOS boxes, the lsb_release is:
```
# cat /etc/lsb-release
DISTRIB_ID="Container Linux by CoreOS"
DISTRIB_RELEASE=2303.3.0
DISTRIB_CODENAME="Rhyolite"
DISTRIB_DESCRIPTION="Container Linux by CoreOS 2303.3.0 (Rhyolite)"
```
```
# uname -a
Linux cloud-worker-25
Forget to mention, I've already disabled the slab merge, so this is what it
is.
Bin 于2020年4月23日周四 下午5:11写道：
> Hey, guys:
>
> I'm running a batch of CoreOS boxes, the lsb_release is:
>
> ```
> # cat /etc/lsb-release
> DISTRIB_ID="Container Linux by CoreOS"
> DISTRIB_RELEASE=2303.3.0
> DISTRIB_COD
Hello? anyone there?
Bin 于2020年4月23日周四 下午5:14写道：
> Forget to mention, I've already disabled the slab merge, so this is what
> it is.
>
> Bin 于2020年4月23日周四 下午5:11写道：
>
>> Hey, guys:
>>
>> I'm running a batch of CoreOS boxes, the lsb_release is:
>>
>> ```
>> # cat /etc/lsb-release
>> DISTRIB_ID="
On 2020-04-24 1:40 am, Bin wrote:
Hello? anyone there?
Bin 于2020年4月23日周四 下午5:14写道：
Forget to mention, I've already disabled the slab merge, so this is what
it is.
Bin 于2020年4月23日周四 下午5:11写道：
Hey, guys:
I'm running a batch of CoreOS boxes, the lsb_release is:
```
# cat /etc/lsb-release
D
Well, that's the problem! I'm assuming the iommu kernel module is leaking
memory. But I don't know why and how.
Do you have any idea about it? Or any further information is needed?
Robin Murphy 于 2020年4月24日周五 19:20写道：
> On 2020-04-24 1:40 am, Bin wrote:
> > Hello? anyone there?
> >
> > Bin 于20
I'm not familiar with the mmu stuff, so what you mean by "some driver
leaking DMA mappings", is it possible that some other kernel module like
KVM or NIC driver leads to the leaking problem instead of the iommu module
itself?
Bin 于 2020年4月24日周五 20:00写道：
> Well, that's the problem! I'm assuming t
On 2020-04-24 1:06 pm, Bin wrote:
I'm not familiar with the mmu stuff, so what you mean by "some driver
leaking DMA mappings", is it possible that some other kernel module like
KVM or NIC driver leads to the leaking problem instead of the iommu module
itself?
Yes - I doubt that intel-iommu itse
Dear Robin:
Thank you for your explanation. Now, I understand that this could be
NIC driver's fault, but how could I confirm it? Do I have to debug the
driver myself?
Robin Murphy 于2020年4月24日周五 下午8:15写道：
> On 2020-04-24 1:06 pm, Bin wrote:
> > I'm not familiar with the mmu stuff, so what you
On 2020-04-24 2:20 pm, Bin wrote:
Dear Robin:
Thank you for your explanation. Now, I understand that this could be
NIC driver's fault, but how could I confirm it? Do I have to debug the
driver myself?
I'd start with CONFIG_DMA_API_DEBUG - of course it will chew through
memory about an ord
On 24/04/2020 17:30, Robin Murphy wrote:
On 2020-04-24 2:20 pm, Bin wrote:
Dear Robin:
Thank you for your explanation. Now, I understand that this could be
NIC driver's fault, but how could I confirm it? Do I have to debug the
driver myself?
I'd start with CONFIG_DMA_API_DEBUG - of cours
Dear John:
Thank you for your reply. The case you mentioned is a typical
performance regression issue, there's no need for the kernel to oom kill
any random process even in the worst case. But in my observations, the
iommu_iova slab could consume up to 40G memory, and the kernel have to kill
my
age-
> From: iommu [mailto:iommu-boun...@lists.linux-foundation.org] On Behalf Of
> Robin Murphy
> Sent: Friday, April 24, 2020 5:31 PM
> To: Bin
> Cc: iommu@lists.linux-foundation.org
> Subject: Re: iommu_iova slab eats too much memory
>
> On 2020-04-24 2:20 pm
iommu-boun...@lists.linux-foundation.org] On Behalf
> Of
> > Robin Murphy
> > Sent: Friday, April 24, 2020 5:31 PM
> > To: Bin
> > Cc: iommu@lists.linux-foundation.org
> > Subject: Re: iommu_iova slab eats too much memory
> >
> > On 2020-04-24 2:20 pm
-
> > From: iommu [mailto:iommu-boun...@lists.linux-foundation.org] On Behalf Of
> > Robin Murphy
> > Sent: Friday, April 24, 2020 5:31 PM
> > To: Bin
> > Cc: iommu@lists.linux-foundation.org
> > Subject: Re: iommu_iova slab eats too much memory
> >
>
Robin Murphy
Sent: Friday, April 24, 2020 5:31 PM
To: Bin
Cc: iommu@lists.linux-foundation.org
Subject: Re: iommu_iova slab eats too much memory
On 2020-04-24 2:20 pm, Bin wrote:
Dear Robin:
Thank you for your explanation. Now, I understand that this could be
NIC driver's fault, but
DMA buffer leak not DMA
> mapping
> >> leak. I doubt VM will get killed due to exhaustion of the DMA mappings in
> the
> >> IOMMU
> >> Layer for a transient reason or even due to mapping/unmapping leak.
> >>
> >> 2. Could you check if you have TSO offload e
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