After upgrading VirtualBox from 6.1 to 7.0.8 on my RHEL 8 host, networking in a Windows 10
guest is glacially slow in one direction. Copying a 200 MB file from a remote system to the
guest is approximately as fast as on the host (~2 seconds), but copying the same file in the
opposite direction effectively stalls, only completing after many minutes. In Wireshark I see
many retransmissions.
Both host and guest have two network interfaces connected to different subnets. The issue
on the guest happens for remote hosts on either subnet. In the guest, the network adapters
are Bridged Adapters of type Intel PRO/1000 MT Desktop (82540EM).
After downgrading to VirtualBox 6.1 the problem is gone. Since both host and guest are
configured identically before the upgrade, after upgrade, and again after downgrade, it
seems only the VirtualBox version is different when the problem occurs.
How do I go about diagnosing the cause of this?
Network slow in one direction after 7.0.8 upgrade
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Re: Network slow in one direction after 7.0.8 upgrade
I personally don't know the answer to this one. Since reverting to 6.1 restores good behavior, it's possible there's a bug, but since Bridged is being used it's also possible there's an incompatibility between 7.0's Bridged driver and the host's network adapter driver, which could also be a bug.
Try zipping/posting a vbox.log from the problematic 7.0 network operation, along with a zipped or linked wireshark trace. Maybe someone can figure it out.
Try zipping/posting a vbox.log from the problematic 7.0 network operation, along with a zipped or linked wireshark trace. Maybe someone can figure it out.
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Re: Network slow in one direction after 7.0.8 upgrade
Finally got to try this again. Attached is the vbox log and a wireshark trace captured on the host. The file transfer was from 205.159.216.154 (the Windows 10 guest) to file server 10.1.102.8. There are lots of duplicate ACK and fast retransmissions. The transfer never finished. This does not happen with vbox 6.x.
- Attachments
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- ws_sample.pcapng.zip
- (122.57 KiB) Downloaded 2 times
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- VBox.log.zip
- (55.86 KiB) Downloaded 4 times
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Re: Network slow in one direction after 7.0.8 upgrade
The Wireshark capture seems to indicate problems with segmentation offloading. Please try the following:
In the VM configuration, disable System > Processor > Nested VT-x/AMD-V and see if the issue persists. Even if you think that this test does not make sense, do it nonetheless.
In the VM configuration, disable one of the network adapters and see if the issue persists.
If the issue persists with both changes applied, create simultaneous Wireshark captures on the host and in the guest. When providing the Wireshark captures, make sure that the TCP handshake is included. Please provide a new (zipped) VBox.log file of the VM run corresponding to the Wireshark captures.
In the VM configuration, disable System > Processor > Nested VT-x/AMD-V and see if the issue persists. Even if you think that this test does not make sense, do it nonetheless.
In the VM configuration, disable one of the network adapters and see if the issue persists.
If the issue persists with both changes applied, create simultaneous Wireshark captures on the host and in the guest. When providing the Wireshark captures, make sure that the TCP handshake is included. Please provide a new (zipped) VBox.log file of the VM run corresponding to the Wireshark captures.
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- Posts: 9
- Joined: 29. Sep 2021, 01:31
- Primary OS: Linux other
- VBox Version: OSE other
- Guest OSses: Linux and Windows 10
- Location: Vancouver, BC
Re: Network slow in one direction after 7.0.8 upgrade
Just returned from a business trip. Thanks for the suggested tests. I will do these, but unfortunately I won't have time to do this for probably another four weeks, as I'm about to leave for a long vacation.Please try the following
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Re: Network slow in one direction after 7.0.8 upgrade
It doesn't really matter if you answer in 1 day or 1 month, I'd anyway have forgotten what I wrote before.
Have a nice vacation!
Have a nice vacation!