[SOLVED] Serial port passthrough issue on big transfers

Inglebard

Renowned Member
May 20, 2016
106
7
83
32
Hi,

We have a proxmox 7 with a workstation setup which run one (and only one) Windows 2000 (yeah I know) guest.
I do not have access to the proxmox but, should be similar to this :

proxmox-ve: 7.0-2 (running kernel: 5.11.22-4-pve) pve-manager: 7.0-11 (running version: 7.0-11/63d82f4e) pve-kernel-5.11: 7.0-7 pve-kernel-helper: 7.0-7 pve-kernel-5.4: 6.4-5 pve-kernel-5.11.22-4-pve: 5.11.22-9 pve-kernel-5.11.22-3-pve: 5.11.22-7 pve-kernel-5.4.128-1-pve: 5.4.128-1 pve-kernel-5.4.124-1-pve: 5.4.124-2 pve-kernel-5.4.106-1-pve: 5.4.106-1 ceph-fuse: 14.2.21-1 corosync: 3.1.5-pve1 criu: 3.15-1+pve-1 glusterfs-client: 9.2-1 ifupdown: 0.8.36+pve1 ksm-control-daemon: 1.4-1 libjs-extjs: 7.0.0-1 libknet1: 1.22-pve1 libproxmox-acme-perl: 1.3.0 libproxmox-backup-qemu0: 1.2.0-1 libpve-access-control: 7.0-4 libpve-apiclient-perl: 3.2-1 libpve-common-perl: 7.0-9 libpve-guest-common-perl: 4.0-2 libpve-http-server-perl: 4.0-2 libpve-storage-perl: 7.0-11 libqb0: 1.0.5-1 libspice-server1: 0.14.3-2.1 lvm2: 2.03.11-2.1 lxc-pve: 4.0.9-4 lxcfs: 4.0.8-pve2 novnc-pve: 1.2.0-3 proxmox-backup-client: 2.0.10-1 proxmox-backup-file-restore: 2.0.10-1 proxmox-mini-journalreader: 1.2-1 proxmox-widget-toolkit: 3.3-6 pve-cluster: 7.0-3 pve-container: 4.0-9 pve-docs: 7.0-5 pve-edk2-firmware: 3.20200531-1 pve-firewall: 4.2-3 pve-firmware: 3.3-1 pve-ha-manager: 3.3-1 pve-i18n: 2.5-1 pve-qemu-kvm: 6.0.0-4 pve-xtermjs: 4.12.0-1 qemu-server: 7.0-14 smartmontools: 7.2-pve2 spiceterm: 3.2-2 vncterm: 1.7-1 zfsutils-linux: 2.0.5-pve1

This guest use a serial port to communicate with a CNC. The transfer works properly when the file to transfer is small.

When the file is bigger (more than 1024-4096 maybe), the transfer failed.
The error message is "invalid format". I suppose the file to be corrupted for some reason.

To have the serial passthrough, I had in the hardware configuration, the following :
serial0: /dev/ttyS0

I also notice the console with xterm is no more working.

Is there a particular configuration to do in the host to make the serial port working properly ?
 

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