Jeroen Van den Keybus wrote:
>> Ouch, this shouldn't be allowed in user space! WBINVD is a privileged
>> instruction. Do we leak privileges to user land??? Please check if your
>> execution mode (privilege ring) is correct there.
>
>
> No, I rather meant a kernel-mode program that was controlled
>
> Ouch, this shouldn't be allowed in user space! WBINVD is a privileged
> instruction. Do we leak privileges to user land??? Please check if your
> execution mode (privilege ring) is correct there.
No, I rather meant a kernel-mode program that was controlled from the user
space. Sorry for upset
[Save the CCs!]
Jeroen Van den Keybus wrote:
>> Indeed, 300 us are too long. Maybe long DMA bursts on your PCI bus? Can
>> you exclude certain devices from your load to check for this (no hardisk
>> load e.g., use nfs instead, then no network load, etc.)?
>
>
> I already tried setting PCI latenc
Jeroen Van den Keybus wrote:
>> So, unless the IRQ below
>> should have been raised much earlier, there is no issue here.
>
>
> The point is: I actually do have interrupts (not the IPI that is visible
> here) that are being withheld (on average 80 us late) during this period. On
> this particular
> So, unless the IRQ below
> should have been raised much earlier, there is no issue here.
The point is: I actually do have interrupts (not the IPI that is visible
here) that are being withheld (on average 80 us late) during this period. On
this particular setup, I have seen numbers exceeding 300
Jeroen Van den Keybus wrote:
> I have a setup which apparently suffers from long interrupt-disabled
> sections during heavy load (make -j16 of a kernel). I have instrumented the
> __ipipe_unstall_iret_root() function with the tracer as follows:
>
>
> asmlinkage void __ipipe_unstall_iret_root(stru
I have a setup which apparently suffers from long interrupt-disabled
sections during heavy load (make -j16 of a kernel). I have instrumented the
__ipipe_unstall_iret_root() function with the tracer as follows:
asmlinkage void __ipipe_unstall_iret_root(struct pt_regs regs)
{
ipipe_trace_specia
