From: Marc Zyngier <maz@kernel.org>
To: Roja malarvathi <reswara1@binghamton.edu>
Cc: kvmarm@lists.cs.columbia.edu
Subject: Re: Regarding Timer Interrupt Latency - ARM64 Guest
Date: Thu, 15 Oct 2020 11:19:54 +0100 [thread overview]
Message-ID: <e24dbc621756b07af01bc07b6bef6d80@kernel.org> (raw)
In-Reply-To: <56798E8F-A2D0-45CE-ABEF-6EF716103B15@hxcore.ol>
Roja,
On 2020-10-15 04:26, Roja malarvathi wrote:
> Hello,
>
> First of all, Thank you so much for the help in advance.
>
> We wrote our own Kernel Level Timer Interrupt Latency test and ran on
> ARM8.2. The Median latency value, when ran on guests is around 30 –
> 35 us.
>
> Guest Kernel-Version: 5.9 with VHE enabled on Host.
>
> Can anyone let me know what should be an expected timer interrupt
> latency range for Guest?
Without you sharing sharing the test harness, nor disclosing the
exact HW this runs, the host configuration and what runs on the
system at the same time, it is pretty hard to guess what constitute
an "expected" latency.
A much more interesting metric is the overhead of virtualization,
which you can derive by running the same test on the host.
M.
--
Jazz is not dead. It just smells funny...
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prev parent reply other threads:[~2020-10-15 10:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-15 3:26 Regarding Timer Interrupt Latency - ARM64 Guest Roja malarvathi
2020-10-15 10:19 ` Marc Zyngier [this message]
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