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Date:      Sat, 26 Nov 2022 23:01:20 +0000
From:      0x1eef <0x1eef@protonmail.com>
To:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   High CPU usage / high number of interrupts
Message-ID:  <NjJeOo65XxAgvh49UV6bzpgNunj1LH1uXy1xnv5QJgjgZfc0xtbKs7PBJb6Ub9LJaPwBKlf94hcsl_Qqt5Yrh_2-BuX5j4MjAdwSGwWEMs4=@protonmail.com>
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[-- Attachment #1 --]
Hi, everyone!

When I use Chromium, I see a high rate of CPU usage across all four cores. The rate can be anywhere from 20% to 50%, even above that. I am not doing anything intensive, just browsing twitter, reddit, YouTube or GitHub. It has been like this since I installed FreeBSD, but since it's not a blocker I have been lazy about looking into it.

I don't know why it happens. I can see that there are a high number of interrupts on 'xhci0', and that seems to carry over to each CPU core as well:

# vmstat -i
interrupt total rate
irq1: atkbd0 50 0
irq9: acpi0 403 0
cpu0:timer 30716618 98
cpu1:timer 25457926 81
cpu2:timer 34344531 109
cpu3:timer 25542867 81
irq128: xhci0 328107434 1044
irq130: nvme0:admin 15 0
irq131: nvme0:io0 701041 2
irq132: nvme0:io1 692045 2
irq133: nvme0:io2 792760 3
irq134: nvme0:io3 693091 2
irq135: hdac0 1718425 5
irq136: vgapci0 6273295 20
Total 455040501 1448

# dmesg | grep xhci0
xhci0: <Intel Ice Lake-LP USB 3.1 controller> mem 0x95110000-0x9511ffff at device 20.0 on pci0
xhci0: 32 bytes context size, 64-bit DMAusbus0 on xhci0

It might also be helpful to know that I tried OpenBSD on the same computer but it was unusable for a similar reason: 95%+ interrupts on CPU. The impact that had made all tasks extremely slow. On FreeBSD it is not as bad, but I still think think it is not normal.

Can anyone suggest what might be wrong, tips to debug, etc ? If more information is needed, please let me know. Thanks for your time.

Best,0x1eef
[-- Attachment #2 --]
<div style="font-family: Arial; font-size: 14px;"><span style="line-height:1.5">Hi, everyone!</span><div style="line-height:1.5"><br></div><div style="line-height:1.5">When I use Chromium, I see a high rate of CPU usage across all four cores. The rate can be anywhere from 20% to 50%, even above that. I am not doing anything intensive, just browsing twitter, reddit, YouTube or GitHub. It has been like this since I installed FreeBSD, but since it's not a blocker I have been lazy about looking into it.</div><div style="line-height:1.5"><br></div><div style="line-height:1.5">I don't know why it happens. I can see that there are a high number of interrupts on 'xhci0', and that seems to carry over to each CPU core as well:</div><div style="line-height:1.5"><br></div><div style="line-height:1.5"><span># vmstat -i &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span><div><span>interrupt &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;total &nbsp; &nbsp; &nbsp; rate</span></div><div><span>irq1: atkbd0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;50 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0</span></div><div><span>irq9: acpi0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;403 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0</span></div><div><span>cpu0:timer &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;30716618 &nbsp; &nbsp; &nbsp; &nbsp; 98</span></div><div><span>cpu1:timer &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;25457926 &nbsp; &nbsp; &nbsp; &nbsp; 81</span></div><div><span>cpu2:timer &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;34344531 &nbsp; &nbsp; &nbsp; &nbsp;109</span></div><div><span>cpu3:timer &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;25542867 &nbsp; &nbsp; &nbsp; &nbsp; 81</span></div><div><span>irq128: xhci0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;328107434 &nbsp; &nbsp; &nbsp; 1044</span></div><div><span>irq130: nvme0:admin &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 15 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0</span></div><div><span>irq131: nvme0:io0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 701041 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2</span></div><div><span>irq132: nvme0:io1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 692045 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2</span></div><div><span>irq133: nvme0:io2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 792760 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3</span></div><div><span>irq134: nvme0:io3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 693091 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2</span></div><div><span>irq135: hdac0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1718425 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5</span></div><div><span>irq136: vgapci0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;6273295 &nbsp; &nbsp; &nbsp; &nbsp; 20</span></div><div><span>Total &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;455040501 &nbsp; &nbsp; &nbsp; 1448</span></div><span></span><br></div><div style="line-height:1.5"><br></div><div style="line-height:1.5"><span># dmesg | grep xhci0</span><div><span>xhci0: &lt;Intel Ice Lake-LP USB 3.1 controller&gt; mem 0x95110000-0x9511ffff at device 20.0 on pci0</span></div><div><span>xhci0: 32 bytes context size, 64-bit DMA</span></div><span>usbus0 on xhci0</span><br></div><div style="line-height:1.5"><br></div><div style="line-height:1.5">It might also be helpful to know that I tried OpenBSD on the same computer but it was unusable for a similar reason: 95%+ interrupts on CPU. The impact that had made all tasks extremely slow. On FreeBSD it is not as bad, but I still think&nbsp; think it is not normal.</div><div style="line-height:1.5"><br></div><div style="line-height:1.5">Can anyone suggest what might be wrong, tips to debug, etc ? If more information is needed, please let me know. Thanks for your time.</div><div style="line-height:1.5"><br></div><div style="line-height:1.5">Best,</div><span style="line-height:1.5">0x1eef</span><br></div><div style="font-family: Arial; font-size: 14px;"><br></div>
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