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nexedi
tsn-measures
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665e4d0e
Commit
665e4d0e
authored
Sep 24, 2020
by
Joanne Hugé
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measure-analysis/measure-report.md
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measure-analysis/measure-report.md
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665e4d0e
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@@ -90,24 +90,30 @@ Metadata | Minimum | Max
## Additional measures
## Packet
recept
ion latency
## Packet
transmiss
ion latency
Shuttle to A20, no XDP
### Shuttle to A20
W
ith tracing and timestamps (some overhead):
#### Measures done w
ith tracing and timestamps (some overhead):
| Latency measured | min | avg | max |
| -------------------------------------- | ------ | ------ | ------ |
| IRQ -> RX SO_TIMESTAMP | 27us | 31us | 136us |
| RX SO_TIMESTAMP -> Userspace timestamp | 85us | 93us | 247us |
| IRQ -> Userspace timestamp | 112us | 124us | 383us |
**Without XDP:**
|
**Latency measured**
|
**min**
|
**avg**
|
**max**
|
| -------------------------------------- | ------- | ------- | ------- |
| IRQ -> RX SO_TIMESTAMP | 27us | 31us | 136us |
| RX SO_TIMESTAMP -> Userspace timestamp | 85us | 93us | 247us |
| IRQ -> Userspace timestamp | 112us | 124us | 383us |
With timestamps (little overhead):
**With XDP:**
| Latency measured | min | avg | max |
| -------------------------------------- | ------ | ------ | ------ |
| Shuttle timestamp -> A20 timestamp | 88us | 88us | 300us |
| RX SO_TIMESTAMP (A20) | 67us | 172us | 173us |
| TX SO_TIMESTAMP -> (Shuttle) | 2us | 18us | 20us |
IRQ -> XDP_REDIRECT : ~30us (more measures needs to be done)
#### Measures done with timestamps (little overhead):
|
**Latency measured**
| |
**Duration**
|
**Packets number**
|
**Interval**
|
**min**
|
**avg**
|
**max**
|
| -------------------------------------- | ------ | ------------ | ------------------ | ------------ | ------- | ------ | ------ |
| Shuttle timestamp -> A20 timestamp | XDP | 2h45 | 50 100 000 | 250us | 22us | 24us | 173us |
| Shuttle timestamp -> A20 timestamp | no XDP | | | | 88us | 88us | 300us |
| RX SO_TIMESTAMP (A20) | no XDP | | | | 67us | 172us | 173us |
| TX SO_TIMESTAMP -> (Shuttle) | no XDP | | | | 2us | 18us | 20us |
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