Re:[PATCH v2 00/59] KVM: iommu: Overhaul device posted IRQs support

From: Sairaj Kodilkar
Date: Mon Jun 09 2025 - 08:21:27 EST

Hi Sean,

Sorry for the delay in testing. All sanity tests are OK. I reran the performance
test on the V2 and noticed that V2 has significantly more GALOG entries than V1
for all three cases. I also noticed that the Guest Nvme interrupt rate has
dropped for the 192 VCPUS.

I haven't figured out what is causing this. I will continue my investigation
further.

VCPUS = 32, Jobs per NVME = 8
==============================================================================================
V2 V1 Percent change
----------------------------------------------------------------------------------------------
Guest Nvme interrupts 124,260,796 124,559,110 -0.20%
IOPS (in kilo) 4,790 4,796 -0.01%
GALOG entries 8117 169 4702%
----------------------------------------------------------------------------------------------


VCPUS = 64, Jobs per NVME = 16
==============================================================================================
V2 V1 Percent change
----------------------------------------------------------------------------------------------
Guest Nvme interrupts 102,394,358 99,800,056 2.00%
IOPS (in kilo) 4,796 4,798 -0.04%
GALOG entries 19,057 11,923 59.83%
----------------------------------------------------------------------------------------------


VCPUS = 192, Jobs per NVME = 48
==============================================================================================
V2 V1 Percent change
----------------------------------------------------------------------------------------------
Guest Nvme interrupts 68,363,232 78,066,512 -12.42%
IOPS (in kilo) 4,751 4,749 -0.04%
GALOG entries 62,768 56,215 11.66%
----------------------------------------------------------------------------------------------

Thanks
Sairaj