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

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Message-ID: <20250609122050.28499-1-sarunkod@amd.com>
Date: Mon, 9 Jun 2025 17:50:50 +0530
From: Sairaj Kodilkar <sarunkod@....com>
To: <seanjc@...gle.com>
CC: <baolu.lu@...ux.intel.com>, <dmatlack@...gle.com>, <dwmw2@...radead.org>,
	<francescolavra.fl@...il.com>, <iommu@...ts.linux.dev>,
	<joao.m.martins@...cle.com>, <joro@...tes.org>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <mlevitsk@...hat.com>, <pbonzini@...hat.com>,
	<sarunkod@....com>, <vasant.hegde@....com>
Subject: Re:[PATCH v2 00/59] KVM: iommu: Overhaul device posted IRQs support

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