Date: Sun, 26 Jan 2020 20:52:51 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 207261] netmap: Doesn't do TX sync with kqueue Message-ID: <bug-207261-7501-zPphKWUdW9@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-207261-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-207261-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207261 --- Comment #9 from Vincenzo Maffione <vmaffione@FreeBSD.org> --- Sorry for being unresponsive on this. The root of the problem is that when netmap was designed, kqueue was not taken in consideration. Support for kqueue was added afterwards. Because of that, there are some locking issues that make it hard for netmap to work well with kqueue. The massive taskqueue usage that you observe are due to recent changes (r343579 and r344253) that fixed a possible deadlock (e.g. with bhyve guests). It's unfortunate that netmap works so bad with kqueue. I would really like to improve the situation, as soon as I have some time to spend on this. It would also really help to have some opinion from people that know the kqueue internals, as I currently have very little knowledge. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug.
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