netdev - Re: [WIP][PATCHES] Network xmit batching

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 19 Jun 2007 19:35:45 +0200
From:	Robert Olsson <Robert.Olsson@...a.slu.se>
To:	hadi@...erus.ca
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Krishna Kumar2 <krkumar2@...ibm.com>,
	Gagan Arneja <gaagaan@...il.com>, netdev@...r.kernel.org,
	Rick Jones <rick.jones2@...com>,
	Sridhar Samudrala <sri@...ibm.com>,
	David Miller <davem@...emloft.net>,
	Robert Olsson <Robert.Olsson@...a.slu.se>
Subject: Re: [WIP][PATCHES] Network xmit batching

jamal writes:

 > What is your kernel config in regards to HRES timers? Robert mentioned
 > to me that the clock source maybe causing issues with pktgen (maybe even
 > qos). Robert, insights?

 pktgen heavily uses gettimeofday. I was using tsc as clock source with 
 our opterons in the lab. In late 2.6.20 gettimeofday was changed so tsc 
 couldn't be used on opterons (pktgen at least). 

 To give you an example w.intel's 82571EB we could send 1.488 Mpps using tsc 
 but with hpet only 400 kpps.

 But Evgeniy is most likely using the same clocksource both for the mainline 
 and batch tests so there must be something different...

 Cheers.
					--ro
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html