All of lore.kernel.org
 help / color / mirror / Atom feed
From: Andi Kleen <andi@firstfloor.org>
To: Harald Servat <harald.servat@bsc.es>
Cc: Andi Kleen <andi@firstfloor.org>,
	"linux-perf-users@vger.kernel.org"
	<linux-perf-users@vger.kernel.org>
Subject: Re: unable to get load latency info
Date: Fri, 28 Feb 2014 17:45:10 +0100	[thread overview]
Message-ID: <20140228164510.GU22728@two.firstfloor.org> (raw)
In-Reply-To: <531095B3.3070800@bsc.es>

>   what do you mean by use-latency here? I understood that PEBS was
> able to report the number of core cycles that the load took to from
> some part of the memory hierarchy until it reached the CPU.

PEBS load/store latency reports the cycles from when the instruction
started issuing in the pipeline to the return of the value. That's not
quite the same, it can be much longer than the pure memory hierarchy
cost.

-Andi

  reply	other threads:[~2014-02-28 16:45 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-28  6:24 unable to get load latency info Muthusamy
2014-02-28 10:43 ` Harald Servat
2014-02-28 11:06 ` Manuel Selva
2014-02-28 13:42 ` Andi Kleen
2014-02-28 13:57   ` Harald Servat
2014-02-28 16:45     ` Andi Kleen [this message]
2014-03-03  5:12       ` Muthusamy
2014-03-03  7:50         ` Harald Servat
     [not found]           ` <1393851732.26401.YahooMailNeo@web125404.mail.ne1.yahoo.com>
2014-03-03 14:24             ` Harald Servat
2014-03-04 10:43               ` Muthusamy

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20140228164510.GU22728@two.firstfloor.org \
    --to=andi@firstfloor.org \
    --cc=harald.servat@bsc.es \
    --cc=linux-perf-users@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.