Date: Sat, 04 Feb 2017 10:48:38 +0100 From: Florian Ermisch <florian.ermisch@alumni.tu-berlin.de> To: freebsd-stable@freebsd.org,Rainer Duffner <rainer@ultra-secure.de> Subject: Re: Problem with FreeBSD as a XenServer Guest - how to debug? Message-ID: <37CEE483-1901-4B8A-AB89-654D6C4DA6C7@alumni.tu-berlin.de> In-Reply-To: <F2B72D04-A4B1-482D-B0C7-FE9CDB26BE07@ultra-secure.de> References: <F2B72D04-A4B1-482D-B0C7-FE9CDB26BE07@ultra-secure.de>
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Hi Rainer, isn't Amazon AWS xen-based? I know Colin Percival (cperciva@) is running tarsnap.com on AWS, maybe he knows how to tune it properly? Looks like he's the one providing FreeBSD images for AWS, too: https://aws.amazon.com/marketplace/pp/B01LWSWRED/ Amazon is probably running a heavily patched version of Xen but looking at the images' sysctls & stuff and running one on your Xen- Server might provide some insights - or at least datapoints. And then there's DTrace to dive into the kernel's inner workings*… Oh, does Xen still provide emulation for other storage controllers like SATA or SAS? If so you may get an at least bearable performance using those. Regards, Florian Am 4. Februar 2017 01:12:11 MEZ schrieb Rainer Duffner <rainer@ultra-secure.de>: > Hi, > > I’ve opened a PR on this: > > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212681 > > and asked on freebsd-virtualization. But nothing came out of it. > > Basically, I/O is very slow inside the FreeBSD guest. Linux guests are > OK. > FreeBSD 10 or 11 doesn’t make a difference. > Haven’t been able to try 12. > > > How can one debug this? > > > > > Rainer > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to > "freebsd-stable-unsubscribe@freebsd.org"help
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