From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
Cc: kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
lguest <lguest-mnsaURCQ41sdnm+yROfE0A@public.gmane.org>,
virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: [kvm-devel] [RFC PATCH 1/5] lguest: mmap backing file
Date: Thu, 20 Mar 2008 17:07:17 +0200 [thread overview]
Message-ID: <47E27DA5.6090703@qumranet.com> (raw)
In-Reply-To: <47E26EE1.5030706-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
Anthony Liguori wrote:
> Rusty Russell wrote:
>
>> From: Paul TBBle Hampson <Paul.Hampson-vM6MUUi4OUAAvxtiuMwx3w@public.gmane.org>
>>
>> This creates a file in $HOME/.lguest/ to directly back the RAM and DMA memory
>> mappings created by map_zeroed_pages.
>>
>>
>
> I created a test program recently that measured the latency of a
> reads/writes to an mmap() file in /dev/shm and in a normal filesystem.
> Even after unlinking the underlying file, the write latency was much
> better with a mmap()'d file in /dev/shm.
>
Surely the difference disappears once the pages have been faulted in?
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-03-20 15:07 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-20 5:59 [RFC PATCH 0/4] Inter-guest virtio I/O example with lguest Rusty Russell
[not found] ` <200803201659.14344.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2008-03-20 6:05 ` [RFC PATCH 1/5] lguest: mmap backing file Rusty Russell
[not found] ` <200803201705.44422.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2008-03-20 6:22 ` [RFC PATCH 2/5] lguest: Encapsulate Guest memory ready for dealing with other Guests Rusty Russell
2008-03-20 6:36 ` [RFC PATCH 3/5] lguest: separate out virtqueue info from device info Rusty Russell
[not found] ` <200803201736.01883.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2008-03-20 6:40 ` [RFC PATCH 4/5] lguest: ignore bad virtqueues Rusty Russell
2008-03-20 6:45 ` [RFC PATCH 5/5] lguest: Inter-guest networking Rusty Russell
2008-03-20 14:04 ` [kvm-devel] [RFC PATCH 1/5] lguest: mmap backing file Anthony Liguori
[not found] ` <47E26EE1.5030706-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2008-03-20 14:32 ` Paul TBBle Hampson
2008-03-20 15:07 ` Avi Kivity [this message]
2008-03-20 15:24 ` Anthony Liguori
2008-03-20 22:12 ` [kvm-devel] " Rusty Russell
2008-03-20 23:46 ` Anthony Liguori
2008-03-23 9:11 ` Avi Kivity
2008-03-20 8:16 ` [Lguest] " Tim Post
[not found] ` <1206000960.6873.124.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-03-20 14:07 ` Paul TBBle Hampson
2008-03-21 0:29 ` Rusty Russell
2008-03-20 6:54 ` [kvm-devel] [RFC PATCH 0/4] Inter-guest virtio I/O example with lguest Avi Kivity
[not found] ` <47E20A35.2000600-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-03-20 13:55 ` Anthony Liguori
[not found] ` <47E26CC1.8080900-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2008-03-20 14:27 ` Avi Kivity
[not found] ` <47E27461.4090404-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-03-20 14:39 ` Anthony Liguori
2008-03-20 14:55 ` Avi Kivity
2008-03-20 15:05 ` Anthony Liguori
2008-03-20 15:36 ` Avi Kivity
[not found] ` <47E28482.9010501-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-03-20 15:52 ` [kvm-devel] " Anthony Liguori
2008-03-20 22:14 ` Rusty Russell
2008-03-20 14:11 ` [kvm-devel] " Anthony Liguori
2008-03-23 12:05 ` Rusty Russell
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