| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <4EE72A0C.7020401@redhat.com> Date: Tue, 13 Dec 2011 12:33:48 +0200 From: Avi Kivity <avi@...hat.com> To: Pekka Enberg <penberg@...nel.org> CC: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, Sasha Levin <levinsasha928@...il.com> Subject: Re: [patch 0/3] kvm tool: Serial emulation overhaul On 12/12/2011 08:31 PM, Pekka Enberg wrote: > On Mon, 2011-12-12 at 20:19 +0200, Avi Kivity wrote: > > On 12/12/2011 01:19 PM, Pekka Enberg wrote: > > > On Sun, Dec 11, 2011 at 5:53 PM, Ingo Molnar <mingo@...e.hu> wrote: > > > > Okay, but look at it from another angle: the top output i > > > > generate is about 300k characters. 5000 msecs to execute it > > > > means 16 usecs overhead per character - or about 50k cycles - on > > > > a top of the class x86 CPU. > > > > > > I'm seeing 1.5 usecs per character for this little benchmark: > > > > No interrupts, right? Things look differently with one interrupt per > > character and none. > > No interrupts. I was simply trying to measure PIO overhead to see how > bad the 15 usec per character Ingo measured really is. Yeah. Anyway, uart serial is never going to be fast. That's what virtio-serial is for. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists