Date: Sat, 4 Feb 2017 18:00:16 +0100 From: Rainer Duffner <rainer@ultra-secure.de> To: Florian Ermisch <florian.ermisch@alumni.tu-berlin.de> Cc: freebsd-stable@freebsd.org Subject: Re: Problem with FreeBSD as a XenServer Guest - how to debug? Message-ID: <9D72A1D4-C728-4405-8101-11734D092615@ultra-secure.de> In-Reply-To: <37CEE483-1901-4B8A-AB89-654D6C4DA6C7@alumni.tu-berlin.de> References: <F2B72D04-A4B1-482D-B0C7-FE9CDB26BE07@ultra-secure.de> <37CEE483-1901-4B8A-AB89-654D6C4DA6C7@alumni.tu-berlin.de>
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> Am 04.02.2017 um 10:48 schrieb Florian Ermisch <florian.ermisch@alumni.tu-berlin.de>: > > 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? It’s not a question of tuning. It’s a factor of 5 that FreeBSD is slower. On SSDs, it’s 10 to 15x. > 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*… > Yes, but I don’t even know there to start. My knowledge of Dtrace is very, very limited. > 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. FreeBSD 10 and 11 contain the „optimal“ support for Xen DomU support out-of-the box, AFAIK (the documentation / wiki for Xen is in a horrible state IMO).
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