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Kernel/IPC: Use 39 microseconds for the SendSyncRequest delay approximation.
As measured by the time it takes for to return when performing the SetLcdForceBlack IPC request to the GSP:GPU service in a n3DS with firmware 11.6 See https://gist.github.com/ds84182/ecdbbd25b56a29bd4e5b32a7544b8e92 for the source code of the test.
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@ -81,8 +81,11 @@ ResultCode ServerSession::HandleSyncRequest(SharedPtr<Thread> thread) {
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// starvation when a thread only does sync requests to HLE services while a
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// lower-priority thread is waiting to run.
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// TODO(Subv): Figure out a good value for this.
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static constexpr u64 IPCDelayNanoseconds = 100;
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// This delay was approximated in a homebrew application by measuring the average time
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// it takes for svcSendSyncRequest to return when performing the SetLcdForceBlack IPC
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// request to the GSP:GPU service in a n3DS with firmware 11.6. The measured values have
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// a high variance and vary between models.
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static constexpr u64 IPCDelayNanoseconds = 39000;
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thread->WakeAfterDelay(IPCDelayNanoseconds);
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} else {
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// Add the thread to the list of threads that have issued a sync request with this
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