From: Or Gerlitz <ogerlitz-smomgflXvOZWk0Htik3J/w@public.gmane.org>
To: Eli Cohen <eli-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>
Cc: Roland Dreier <rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>,
linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: kernel inline sending / UARs / etc
Date: Mon, 08 Nov 2010 10:27:15 +0200 [thread overview]
Message-ID: <4CD7B463.2030402@voltaire.com> (raw)
In-Reply-To: <E113D394D7C5DB4F8FF691FA7EE9DB443D1BB387C7-WQlSmcKwN8Te+A/uUDamNg@public.gmane.org>
Eli Cohen wrote:
> The idea is to let kernel consumers enjoy the improvements to latency that blue flame gives. And yes, SDP is motivating us but I am going to push to IPoIB too.
>
From my recollection of numbers, for user space apps, using inline
accounts for about 1us improvement in the latency, if this is indeed the
case, I'm sure if there's great value here for kernel consumers, do you
have any numbers to support this patch?
> I want to take the opportunity that you raised the issue to hear others opinion about changing the bitmap allocator maintain an "avail" variable that will count the number of available UARs. I want to use this to limit the number of UARs that a kernel consumer can allocate so that there will always be some available for userspace
Is this correct that today all the kernels QPs use the same UAR, any
problem with that?
Or.
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next prev parent reply other threads:[~2010-11-08 8:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-08 7:37 Fix IPoIB to conform to ethtool definitions Or Gerlitz
[not found] ` <Pine.LNX.4.64.1011080936200.14213-aDiYczhfhVLdX2U7gxhm1tBPR1lH4CV8@public.gmane.org>
2010-11-08 7:41 ` Eli Cohen
[not found] ` <E113D394D7C5DB4F8FF691FA7EE9DB443D1BB38721-WQlSmcKwN8Te+A/uUDamNg@public.gmane.org>
2010-11-08 7:51 ` Or Gerlitz
[not found] ` <4CD7ABF4.5090305-hKgKHo2Ms0FWk0Htik3J/w@public.gmane.org>
2010-11-08 8:02 ` Eli Cohen
[not found] ` <E113D394D7C5DB4F8FF691FA7EE9DB443D1BB387C7-WQlSmcKwN8Te+A/uUDamNg@public.gmane.org>
2010-11-08 8:27 ` Or Gerlitz [this message]
[not found] ` <4CD7B463.2030402-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2010-11-08 8:31 ` kernel inline sending / UARs / etc Eli Cohen
2010-11-08 8:45 ` Or Gerlitz
[not found] ` <4CD7B8B6.4060704-hKgKHo2Ms0FWk0Htik3J/w@public.gmane.org>
2010-11-08 8:49 ` Eli Cohen
2010-11-08 8:51 ` Or Gerlitz
[not found] ` <4CD7BA12.5090704-hKgKHo2Ms0FWk0Htik3J/w@public.gmane.org>
2010-11-08 10:10 ` Amir Vadai
2010-11-08 12:47 ` Eli Cohen
2010-11-08 13:24 ` Or Gerlitz
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