testing without the translation cache

testing without the translation cache

[Brian Cain]

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Alex,

A very long time ago QEMU supported disabling the translation cache via "-translation no-cache".  That option was deliberately removed.  We are looking into a hexagon-specific failure when there's a TB lookup miss from a cpu_loop_exit_restore().    I'd like to test our fix for this failure and was wondering if there's any mechanism to disable the cache.  There's a "-accel tcg,tb-size=0" - but this won't accomplish what I'm looking to do - will it?  If not, is there another way to disable the cache?

-Brian

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Re: testing without the translation cache

[Richard Henderson]

On 1/9/24 09:34, Brian Cain wrote:
> Alex,
> 
> A very long time ago QEMU supported disabling the translation cache via “-translation 
> no-cache”.  That option was deliberately removed.  We are looking into a hexagon-specific 
> failure when there’s a TB lookup miss from a cpu_loop_exit_restore().   I’d like to test 
> our fix for this failure and was wondering if there’s any mechanism to disable the cache.  
> There’s a “-accel tcg,tb-size=0” – but this won’t accomplish what I’m looking to do – will 
> it?  If not, is there another way to disable the cache?

There is no way to disable the cache, only to make it small so that it overflows often.


r~