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=20 tarsnap=2Ecom on AWS, maybe he knows how=20 to tune it properly? Looks like he's the one providing FreeBSD=20 images for AWS, too: https://aws=2Eamazon=2Ecom/marketplace/pp/B01LWSWRED/ Amazon is probably running a heavily patched version of Xen but looking at the images'=20 sysctls & stuff and running one on your Xen- Server might provide some insights - or at least datapoints=2E And then there's DTrace to dive into the=20 kernel's inner workings*=E2=80=A6 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=2E Regards, Florian Am 4=2E Februar 2017 01:12:11 MEZ schrieb Rainer Duffner <rainer@ultra-sec= ure=2Ede>: > Hi, >=20 > I=E2=80=99ve opened a PR on this: >=20 > https://bugs=2Efreebsd=2Eorg/bugzilla/show_bug=2Ecgi?id=3D212681 >=20 > and asked on freebsd-virtualization=2E But nothing came out of it=2E >=20 > Basically, I/O is very slow inside the FreeBSD guest=2E Linux guests are > OK=2E > FreeBSD 10 or 11 doesn=E2=80=99t make a difference=2E > Haven=E2=80=99t been able to try 12=2E >=20 >=20 > How can one debug this? >=20 >=20 >=20 >=20 > Rainer > _______________________________________________ > freebsd-stable@freebsd=2Eorg mailing list > https://lists=2Efreebsd=2Eorg/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to > "freebsd-stable-unsubscribe@freebsd=2Eorg"
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