Revert "Use readv for the RX path of the network device to avoid one memory copy per frame"
#4841
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This reverts commit bc0ba43. Signed-off-by: Babis Chalios <[email protected]>
This reverts commit 667aba4. Signed-off-by: Babis Chalios <[email protected]>
This reverts commit 5d718d4. Signed-off-by: Babis Chalios <[email protected]>
… objects" This reverts commit 14e6e33. Signed-off-by: Babis Chalios <[email protected]>
This reverts commit 1e4c632. Signed-off-by: Babis Chalios <[email protected]>
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #4841 +/- ##
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- Coverage 84.42% 84.35% -0.07%
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Files 250 249 -1
Lines 27749 27505 -244
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- Hits 23427 23202 -225
+ Misses 4322 4303 -19
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The changes introduced in IoVecBufferMut that allowed implementing readv support for virtio-net regressed the performance of vsock device. This is because now, when we create IoVecBufferMut objects we do a bunch (1 memfd_create and 3 mmap) of system calls. virtio-net device avoids the performance issue because it creates a single IoVecBufferMut and re-uses it, whereas vsock is creating a new IoVecBufferMut object for every packet it receives.
We have a fix for this, which essentially creates a single IoVecBufferMut that reuses for all the incoming vsock packets during a connection. The problem with the fix is that it makes unit-tests really unhappy and we need a significant amount of work to fix them.
So, revert the PR to have main in a clean state. We will fix the vsock issues out-of-band and re-open the PR.
Reverts #4799