Date: Sun, 18 Feb 2024 09:21:10 -0600 From: Matthew Grooms <mgrooms@shrew.net> To: virtualization@freebsd.org Subject: Re: bhyve disk performance issue Message-ID: <50614ea4-f0f9-44a2-b5e6-ebb33cfffbc4@shrew.net> In-Reply-To: <6f6b71ac-2349-4045-9eaf-5c50d42b89be@shrew.net> References: <6a128904-a4c1-41ec-a83d-56da56871ceb@shrew.net> <28ea168c-1211-4104-b8b4-daed0e60950d@app.fastmail.com> <0ff6f30a-b53a-4d0f-ac21-eaf701d35d00@shrew.net> <6f6b71ac-2349-4045-9eaf-5c50d42b89be@shrew.net>
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On 2/17/24 15:53, Matthew Grooms wrote:
> On 2/16/24 12:00, Matthew Grooms wrote:
>> On 2/16/24 11:42, Chuck Tuffli wrote:
>>> On Fri, Feb 16, 2024, at 9:19 AM, Matthew Grooms wrote:
>>>>
>>>> Hi All,
>>>>
>>>>
>>>> I'm in the middle of a project that involves building out a handful
>>>> of servers to host virtual Linux instances. Part of that includes
>>>> testing bhyve to see how it performs. The intent is to compare host
>>>> storage options such as raw vs zvol block devices and ufs vs zfs
>>>> disk images using hardware raid vs zfs managed disks. It would also
>>>> involve
>>>>
>>>>
>>> …
>>>>
>>>> Here is a list of a few other things I'd like to try:
>>>>
>>>>
>>>> 1) Wiring guest memory ( unlikely as it's 32G of 256G )
>>>> 2) Downgrading the host to 13.2-RELEASE
>>>
>>> FWIW we recently did a similar exercise and saw significant
>>> performance differences on ZFS backed disk images when comparing
>>> 14.0 and 13.2. We didn’t have time to root cause the difference, so
>>> it could simply be some tuning difference needed for 14.
>>
>> Hi Chuck,
>>
>> That's very helpful feedback. I'll start by downgrading the host to
>> 13.2 and report back here.
>>
>
> Unfortunately same story with 13.2. I'm going to try and downgrade to
> 12.4 and see if it gets any better.
>
> ================================================================================
> Begin @ Sat Feb 17 11:00:01 CST 2024
>
> Version 2.00 ------Sequential Output------ --Sequential Input-
> --Random-
> -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks--
> Name:Size etc /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
> /sec %CP
> localhost.lo 63640M 690k 99 1.5g 97 727m 78 950k 99 1.3g 68
> +++++ +++
> Latency 11759us 29114us 8098us 8649us 23413us
> 4540us
> Version 2.00 ------Sequential Create------ --------Random
> Create--------
> localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
> files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
> /sec %CP
> 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
> +++++ +++
> Latency 7791us 131us 1671us 464us 15us 1811us
>
> End @ Sat Feb 17 11:03:13 CST 2024
> ================================================================================
> Begin @ Sat Feb 17 11:10:01 CST 2024
>
> Version 2.00 ------Sequential Output------ --Sequential Input-
> --Random-
> -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks--
> Name:Size etc /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
> /sec %CP
> localhost.lo 63640M 667k 99 449m 99 313m 94 940k 99 398m 99
> 16204 563
> Latency 12147us 1079us 24470us 8795us 17853us
> 4384us
> Version 2.00 ------Sequential Create------ --------Random
> Create--------
> localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
> files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
> /sec %CP
> 16 0 93 +++++ +++ +++++ +++ 0 96 +++++ +++
> +++++ +++
> Latency 118us 159us 269us 164us 54us 844us
>
> End @ Sat Feb 17 11:18:43 CST 2024
>
I wasn't able to get a working 12.4 system in place due to lack of
packages. However, I did fire up a FreeBSD 14 VM and let it run
overnight on the same SSD array. It consistently ran at a much higher
speed for 50+ runs @ 10m intervals ...
================================================================================
Begin @ Sun Feb 18 15:00:00 UTC 2024
Version 1.98 ------Sequential Output------ --Sequential Input-
--Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Name:Size etc /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
freebsd.shrew.l 64G 628k 99 1.6g 98 831m 60 1278k 99 1.1g 42
+++++ +++
Latency 13447us 68490us 207ms 7187us 195ms 17665us
Version 1.98 ------Sequential Create------ --------Random
Create--------
freebsd.shrew.lab -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
+++++ +++
Latency 18225us 18us 28us 18812us 18us 25us
End @ Sun Feb 18 15:03:11 UTC 2024
I used identical options to run both that VM and the Linux VM I've been
testing. The backing store for each VM has a 1TB partition and the guest
interfaces are NVME. Now I'm really scratching my head.
Chuck, were you testing disk performance in Linux VMs or only FreeBSD?
Anyone have ideas on why Linux disk performance would drop off a cliff
over time?
Thanks,
Thanks,
-Matthew
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<div class="moz-cite-prefix">On 2/17/24 15:53, Matthew Grooms wrote:<br>
</div>
<blockquote type="cite"
cite="mid:6f6b71ac-2349-4045-9eaf-5c50d42b89be@shrew.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div class="moz-cite-prefix">On 2/16/24 12:00, Matthew Grooms
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:0ff6f30a-b53a-4d0f-ac21-eaf701d35d00@shrew.net">
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
On 2/16/24 11:42, Chuck Tuffli wrote:<br>
<blockquote type="cite"
cite="mid:28ea168c-1211-4104-b8b4-daed0e60950d@app.fastmail.com">
<meta http-equiv="content-type"
content="text/html; charset=UTF-8">
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<div>On Fri, Feb 16, 2024, at 9:19 AM, Matthew Grooms wrote:<br>
</div>
<blockquote type="cite" id="qt" style="">
<p>Hi All,<br>
</p>
<p><br>
</p>
<div>I'm in the middle of a project that involves building
out a handful of servers to host virtual Linux instances.
Part of that includes testing bhyve to see how it
performs. The intent is to compare host storage options
such as raw vs zvol block devices and ufs vs zfs disk
images using hardware raid vs zfs managed disks. It would
also involve<br>
</div>
<p><br>
</p>
</blockquote>
<div>…<br>
</div>
<blockquote type="cite" id="qt" style="">
<p><span style="color:rgb(27, 30, 32);">Here is a list of a
few other things I'd like to try:</span><br>
</p>
<div> <br>
</div>
<div> 1) Wiring guest memory ( unlikely as it's 32G of 256G
)<br>
</div>
<div> 2) Downgrading the host to 13.2-RELEASE<br>
</div>
</blockquote>
<div><br>
</div>
<div>FWIW we recently did a similar exercise and saw
significant performance differences on ZFS backed disk
images when comparing 14.0 and 13.2. We didn’t have time to
root cause the difference, so it could simply be some tuning
difference needed for 14. <br>
</div>
</blockquote>
<br>
<p>Hi Chuck,</p>
<p>That's very helpful feedback. I'll start by downgrading the
host to 13.2 and report back here.<br>
<br>
</p>
</blockquote>
<p><br>
Unfortunately same story with 13.2. I'm going to try and
downgrade to 12.4 and see if it gets any better.<br>
<br>
</p>
<p>================================================================================<br>
Begin @ Sat Feb 17 11:00:01 CST 2024<br>
<br>
Version 2.00 ------Sequential Output------ --Sequential
Input- --Random-<br>
-Per Chr- --Block-- -Rewrite- -Per Chr-
--Block-- --Seeks--<br>
Name:Size etc /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP /sec %CP<br>
localhost.lo 63640M 690k 99 1.5g 97 727m 78 950k 99
1.3g 68 +++++ +++<br>
Latency 11759us 29114us 8098us 8649us
23413us 4540us<br>
Version 2.00 ------Sequential Create------ --------Random
Create--------<br>
localhost.localdoma -Create-- --Read--- -Delete-- -Create--
--Read--- -Delete--<br>
files /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP /sec %CP<br>
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++
+++++ +++ +++++ +++<br>
Latency 7791us 131us 1671us 464us
15us 1811us<br>
<br>
End @ Sat Feb 17 11:03:13 CST 2024<br>
================================================================================<br>
Begin @ Sat Feb 17 11:10:01 CST 2024<br>
<br>
Version 2.00 ------Sequential Output------ --Sequential
Input- --Random-<br>
-Per Chr- --Block-- -Rewrite- -Per Chr-
--Block-- --Seeks--<br>
Name:Size etc /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP /sec %CP<br>
localhost.lo 63640M 667k 99 449m 99 313m 94 940k 99
398m 99 16204 563<br>
Latency 12147us 1079us 24470us 8795us
17853us 4384us<br>
Version 2.00 ------Sequential Create------ --------Random
Create--------<br>
localhost.localdoma -Create-- --Read--- -Delete-- -Create--
--Read--- -Delete--<br>
files /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP /sec %CP<br>
16 0 93 +++++ +++ +++++ +++ 0 96
+++++ +++ +++++ +++<br>
Latency 118us 159us 269us 164us
54us 844us<br>
<br>
End @ Sat Feb 17 11:18:43 CST 2024<br>
<br>
</p>
</blockquote>
<p>I wasn't able to get a working 12.4 system in place due to lack
of packages. However, I did fire up a FreeBSD 14 VM and let it run
overnight on the same SSD array. It consistently ran at a much
higher speed for 50+ runs @ 10m intervals ...<br>
<br>
================================================================================<br>
Begin @ Sun Feb 18 15:00:00 UTC 2024<br>
<br>
Version 1.98 ------Sequential Output------ --Sequential
Input- --Random-<br>
-Per Chr- --Block-- -Rewrite- -Per Chr-
--Block-- --Seeks--<br>
Name:Size etc /sec %CP /sec %CP /sec %CP /sec %CP /sec
%CP /sec %CP<br>
freebsd.shrew.l 64G 628k 99 1.6g 98 831m 60 1278k 99 1.1g
42 +++++ +++<br>
Latency 13447us 68490us 207ms 7187us
195ms 17665us<br>
Version 1.98 ------Sequential Create------ --------Random
Create--------<br>
freebsd.shrew.lab -Create-- --Read--- -Delete-- -Create--
--Read--- -Delete--<br>
files /sec %CP /sec %CP /sec %CP /sec %CP /sec
%CP /sec %CP<br>
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++
+++ +++++ +++<br>
Latency 18225us 18us 28us 18812us
18us 25us<br>
<br>
End @ Sun Feb 18 15:03:11 UTC 2024<br>
<br>
I used identical options to run both that VM and the Linux VM I've
been testing. The backing store for each VM has a 1TB partition
and the guest interfaces are NVME. Now I'm really scratching my
head.<br>
<br>
Chuck, were you testing disk performance in Linux VMs or only
FreeBSD?<br>
<br>
Anyone have ideas on why Linux disk performance would drop off a
cliff over time?<br>
<br>
Thanks,<br>
<br>
Thanks,</p>
<p>-Matthew<br>
</p>
</body>
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