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Re: kprobes performance on i386 vs x86_64
- From: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>
- To: "Keshavamurthy, Anil S" <anil dot s dot keshavamurthy at intel dot com>
- Cc: Martin Hunt <hunt at redhat dot com>, systemtap at sources dot redhat dot com, Satoshi Oshima <soshima at redhat dot com>, Yumiko Sugita <yumiko dot sugita dot yf at hitachi dot com>
- Date: Tue, 23 Jan 2007 11:25:06 +0900
- Subject: Re: kprobes performance on i386 vs x86_64
- Organization: Systems Development Lab., Hitachi, Ltd., Japan
- References: <8A3E977AB3C24845947ADAAE0526E395015F9BA7@orsmsx419.amr.corp.intel.com>
Hi,
Keshavamurthy, Anil S wrote:
> Possible. Can you rerun the same tests again with some dummy
> post-kprobe-handler as djprobes will not come into effect if you have
> post-kprobe-handler.
You are right.
By the way, that is the effects of the kprobe-booster
(djprobe is not merged yet).
Thanks,
--
Masami HIRAMATSU
Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com
>
> Thanks,
>
> -Anil Keshavamurthy
> Open Source Technology Center/SSG
> Intel Corp.
> (w) 503-712-4476
> email: anil.s.keshavamurthy@intel.com
>
> -----Original Message-----
> From: systemtap-owner@sourceware.org
> [mailto:systemtap-owner@sourceware.org] On Behalf Of Martin Hunt
> Sent: Monday, January 22, 2007 11:56 AM
> To: systemtap@sources.redhat.com
> Subject: kprobes performance on i386 vs x86_64
>
> Is there a reason why i386 kprobes are 2-3 times faster than x86_64 on
> 2.6.19? This is on the same hardware. Is djprobes only working on i386
> or something?
>
> Martin
>
>
>