linux-kernel - Re: [E1000-devel] e1000 1sec latency problem

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, 07 Feb 2008 10:06:40 -0800
From:	Max Krasnyansky <maxk@...lcomm.com>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
CC:	Pavel Machek <pavel@....cz>, e1000-devel@...ts.sourceforge.net,
	jesse.brandeburg@...el.com,
	kernel list <linux-kernel@...r.kernel.org>,
	john.ronciak@...el.com, jeffrey.t.kirsher@...el.com
Subject: Re: [E1000-devel] e1000 1sec latency problem

Kok, Auke wrote:
> Max Krasnyansky wrote:
>> So you don't think it's related to the interrupt coalescing by any chance ?
>> I'd suggest to try and disable the coalescing and see if it makes any difference.
>> We've had lots of issues with coalescing misbehavior. Not this bad (ie 1 second) though.
>>
>> Add this to modprobe.conf and reload e1000 module
>>
>> options e1000 RxIntDelay=0,0 RxAbsIntDelay=0,0 InterruptThrottleRate=0,0 TxIntDelay=0,0 TxAbsIntDelay=0,0
> 
> that can't be the problem. irq moderation would only account for 2-3ms variance
> maximum.
Oh, I've definitely seen worse than that. Not as bad as a 1second though. Plus you're talking
about the case when coalescing logic is working as designed ;-). What if there is some kind of 
bug where timer did not expire or something.

Max
--
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/