netdev - Re: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

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:	Thu, 14 Apr 2011 18:45:24 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	Wei Gu <wei.gu@...csson.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	netdev <netdev@...r.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: Re: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

Le jeudi 14 avril 2011 à 09:42 -0700, Alexander Duyck a écrit :

> The only issue I have found so far with the ixgbe driver is the fact 
> that apparently rx_no_buffer_count is apparently always going to be 0 on 
> 82599, and that isn't so much a driver problem as a hardware limitation 
> as the HW counter was removed in 82599.  However since the hardware was 
> capable of going faster on the other kernels what this likely means is 
> that the rx_missed_errors are due to the driver not providing Rx buffers 
> fast enough.
> 
> I'm doing some more digging into this now.  One thought that occurred to 
> me is that if the patch you mention is having some sort of effect this 
> could be a sign of perhaps a kernel timer or scheduling problem.

We could try to instrument the delay betwen hardware IRQ and napi
handler called.



--
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