Pcap networking kills performance?

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scubasteve
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Joined: Sun 14 Jul, 2019 10:27 pm

Pcap networking kills performance?

Post by scubasteve » Tue 16 Jul, 2019 2:43 am

I've been on a retro binge lately and absolutely loving PCEm. Ran into an issue the other day though that almost made me give up on it, so I wanted to post here (first time) to make sure you're aware.

Thing is, I was seeing performance dips like crazy trying to emulate anything above a Pentium 75 on my i7 Skylake. And I do realize that being the actual limit of what I can emulate wasn't out of the question (hence almost giving up.) I started fiddling with settings though and eventually found that switching from pcap to slirp completely resolved the issue, and I am now able to run a 233 Mmx at almost constant 100%.

The really weird thing is this was happening not only in Windows 95, but also in DOS where I don't think any kind of network discovery stuff would be running. It seemed to impact performance equally on both DOS and Windows.

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