[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: XSA-332 kernel patch - huge network performance on pfSense VMs
Le 18/01/2021 à 11:03, Roger Pau Monné a écrit : On Fri, Jan 15, 2021 at 03:03:26PM +0000, Samuel Verschelde wrote: >> Hi list, >> >> Another "popular" thread on XCP-ng forum [1], started in october >> 2020, allowed us to detect that patch 12 from the XSA-332 advisory >> [2] had a very significant impact on network performance in the >> case of pfSense VMs. >> >> We reproduced the issue internally (well, we reproduced >> "something". The user setups in this thread are diverse) and our >> findings seem to confirm what the users reported. Running iperf3 >> from the pfSense VM to a debian VM gives results around 5 times >> slower than before. Reverting this single patch brings the >> performance back. On the debian to pfSense direction, the drop is >> about 25%. > > pfSense is based on FreeBSD, so I would bet that whatever performance > degradation you are seeing would also happen with plain FreeBSD. I > would assume netfront in FreeBSD is triggering the ratelimit on > Linux, and hence it gets throttled. > > Do you think you have the bandwidth to look into the FreeBSD side and > try to provide a fix? I'm happy to review and commit in upstream > FreeBSD, but would be nice to have someone else also in the loop as > ATM I'm the only one doing FreeBSD/Xen development AFAIK. > I would personnally not be able to hack into either Xen, the linux kernel or FreeBSD in any efficient way. My role here is limited to packaging, testing and acting as a relay between users and developers. We currently don't have anyone at Vates who would be able to hack into FreeBSD either. What currently puts FreeBSD into our radar is the large amount of users who use FreeNAS/TrueNAS or pfSense VMs, and the recent bugs they detected (XSA-360 and this performance drop). Additionnally, regarding this performance issue, some users report an impact of that same patch 12 on the network performance of their non-BSD VMs [1][2], so I think the FreeBSD case might be helpful to help identify what in that patch caused throttling (if that's what happens), because it's easier to reproduce, but I'm not sure fixes would only need to be made in FreeBSD. Best regards, Samuel Verschelde [1] https://xcp-ng.org/forum/post/35521 mentions debian based Untangle OS and inter-VLAN traffic [2] https://xcp-ng.org/forum/post/35476 general slowdown affecting all VMs (VM to workstation traffic), from the first user who identified patch 12 as the cause.
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |