How to troubleshoot high kernel time (high network usage; high interrupts)What are software and hardware...
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How to troubleshoot high kernel time (high network usage; high interrupts)
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I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
linux networking kernel troubleshooting interrupt
edited Mar 25 '16 at 3:25
kenorb
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bumped to the homepage by Community♦ 39 mins ago
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I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
linux networking kernel troubleshooting interrupt
edited Mar 25 '16 at 3:25
kenorb
10.3k4 gold badges83 silver badges124 bronze badges
bumped to the homepage by Community♦ 39 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
1
Do you have a lot of firewall rules that have to be processed?
– jordanm
Apr 1 '13 at 5:10
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I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
linux networking kernel troubleshooting interrupt
edited Mar 25 '16 at 3:25
kenorb
10.3k4 gold badges83 silver badges124 bronze badges
I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
linux networking kernel troubleshooting interrupt
linux networking kernel troubleshooting interrupt
edited Mar 25 '16 at 3:25
kenorb
10.3k4 gold badges83 silver badges124 bronze badges
edited Mar 25 '16 at 3:25
kenorb
10.3k4 gold badges83 silver badges124 bronze badges
edited Mar 25 '16 at 3:25
kenorb
10.3k4 gold badges83 silver badges124 bronze badges
edited Mar 25 '16 at 3:25
kenorb
10.3k4 gold badges83 silver badges124 bronze badges
edited Mar 25 '16 at 3:25
kenorb
10.3k4 gold badges83 silver badges124 bronze badges
10.3k4 gold badges83 silver badges124 bronze badges
asked Apr 1 '13 at 2:56
user26053
bumped to the homepage by Community♦ 39 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 39 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 39 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
1
Do you have a lot of firewall rules that have to be processed?
– jordanm
Apr 1 '13 at 5:10
add a comment
|
1
Do you have a lot of firewall rules that have to be processed?
– jordanm
Apr 1 '13 at 5:10
1
1
Do you have a lot of firewall rules that have to be processed?
– jordanm
Apr 1 '13 at 5:10
Do you have a lot of firewall rules that have to be processed?
– jordanm
Apr 1 '13 at 5:10
add a comment
|
1 Answer
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The systemtap stuff is supposed to let you drill down into the kernel, and lately also applications, for tracing, troubleshooting, and debugging. Haven't used it myself.
High interrupt traffic for high network traffic might be due to less-than-bright network card or driver, perhaps a higer-end card gives better results. The kernel's handling of networking has also improved, perhaps updating the kernel helps.
OTOH, if 50% of CPU usage goes to interrupts, and CPU utilization is 3%, there should be nothing to worry about... review the data you have (and how you collected it, what the exact meaning of the numbers is) and think it over.
In the end, the question shouldn't be "Measuring foo gives bar", but start with "Performance is bad/unacceptable, what do I need to measure to find out where the bottleneck is, so I can remove it". If that leads to the above question, fine, but then you know where you are going.
answered Apr 1 '13 at 14:18
vonbrandvonbrand
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1 Answer
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The systemtap stuff is supposed to let you drill down into the kernel, and lately also applications, for tracing, troubleshooting, and debugging. Haven't used it myself.
High interrupt traffic for high network traffic might be due to less-than-bright network card or driver, perhaps a higer-end card gives better results. The kernel's handling of networking has also improved, perhaps updating the kernel helps.
OTOH, if 50% of CPU usage goes to interrupts, and CPU utilization is 3%, there should be nothing to worry about... review the data you have (and how you collected it, what the exact meaning of the numbers is) and think it over.
In the end, the question shouldn't be "Measuring foo gives bar", but start with "Performance is bad/unacceptable, what do I need to measure to find out where the bottleneck is, so I can remove it". If that leads to the above question, fine, but then you know where you are going.
answered Apr 1 '13 at 14:18
vonbrandvonbrand
14.6k2 gold badges27 silver badges47 bronze badges
add a comment
|
The systemtap stuff is supposed to let you drill down into the kernel, and lately also applications, for tracing, troubleshooting, and debugging. Haven't used it myself.
High interrupt traffic for high network traffic might be due to less-than-bright network card or driver, perhaps a higer-end card gives better results. The kernel's handling of networking has also improved, perhaps updating the kernel helps.
OTOH, if 50% of CPU usage goes to interrupts, and CPU utilization is 3%, there should be nothing to worry about... review the data you have (and how you collected it, what the exact meaning of the numbers is) and think it over.
In the end, the question shouldn't be "Measuring foo gives bar", but start with "Performance is bad/unacceptable, what do I need to measure to find out where the bottleneck is, so I can remove it". If that leads to the above question, fine, but then you know where you are going.
answered Apr 1 '13 at 14:18
vonbrandvonbrand
14.6k2 gold badges27 silver badges47 bronze badges
add a comment
|
The systemtap stuff is supposed to let you drill down into the kernel, and lately also applications, for tracing, troubleshooting, and debugging. Haven't used it myself.
High interrupt traffic for high network traffic might be due to less-than-bright network card or driver, perhaps a higer-end card gives better results. The kernel's handling of networking has also improved, perhaps updating the kernel helps.
OTOH, if 50% of CPU usage goes to interrupts, and CPU utilization is 3%, there should be nothing to worry about... review the data you have (and how you collected it, what the exact meaning of the numbers is) and think it over.
In the end, the question shouldn't be "Measuring foo gives bar", but start with "Performance is bad/unacceptable, what do I need to measure to find out where the bottleneck is, so I can remove it". If that leads to the above question, fine, but then you know where you are going.
answered Apr 1 '13 at 14:18
vonbrandvonbrand
14.6k2 gold badges27 silver badges47 bronze badges
The systemtap stuff is supposed to let you drill down into the kernel, and lately also applications, for tracing, troubleshooting, and debugging. Haven't used it myself.
High interrupt traffic for high network traffic might be due to less-than-bright network card or driver, perhaps a higer-end card gives better results. The kernel's handling of networking has also improved, perhaps updating the kernel helps.
OTOH, if 50% of CPU usage goes to interrupts, and CPU utilization is 3%, there should be nothing to worry about... review the data you have (and how you collected it, what the exact meaning of the numbers is) and think it over.
In the end, the question shouldn't be "Measuring foo gives bar", but start with "Performance is bad/unacceptable, what do I need to measure to find out where the bottleneck is, so I can remove it". If that leads to the above question, fine, but then you know where you are going.
answered Apr 1 '13 at 14:18
vonbrandvonbrand
14.6k2 gold badges27 silver badges47 bronze badges
answered Apr 1 '13 at 14:18
vonbrandvonbrand
14.6k2 gold badges27 silver badges47 bronze badges
answered Apr 1 '13 at 14:18
vonbrandvonbrand
14.6k2 gold badges27 silver badges47 bronze badges
answered Apr 1 '13 at 14:18
vonbrandvonbrand
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14.6k2 gold badges27 silver badges47 bronze badges
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1
Do you have a lot of firewall rules that have to be processed?
– jordanm
Apr 1 '13 at 5:10