From: Hongkaixing <hongkaixing@huawei.com>
To: 'Olaf Hering' <olaf@aepfle.de>
Cc: bicky.shi@huawei.com, xiaowei.yang@huawei.com,
xen-devel@lists.xensource.com, yanqiangjun@huawei.com,
hanweidong@huawei.com
Subject: Re: [PATCH] xenpaging:add a new array to speed up page-in in xenpaging
Date: Sat, 07 Jan 2012 16:55:49 +0800 [thread overview]
Message-ID: <002c01cccd1a$279c9a00$76d5ce00$@com> (raw)
In-Reply-To: <20120106130737.GB1694@aepfle.de>
> -----Original Message-----
> From: Olaf Hering [mailto:olaf@aepfle.de]
> Sent: Friday, January 06, 2012 9:08 PM
> To: hongkaixing@huawei.com
> Cc: xen-devel@lists.xensource.com
> Subject: Re: [PATCH] xenpaging:add a new array to speed up page-in in xenpaging
>
> On Thu, Jan 05, Olaf Hering wrote:
>
> > Is the page-out time for 512M really that fast? For me page-out is still
> > really slow even when the pagefile is in tmpfs. It takes several
> > minutes, I get around 4MB/s. page-in is around 20MB/s.
>
> Wait, the slow page-out is due to the poll() timeout in
> xenpaging_wait_for_event_or_timeout(). This can be fixed with some sort
> of dynamic timeout while there is still something to page-out.
I don't think so. Our approach still use 100ms in poll(), Using 10ms seems no significant change.
In my opinion, In order to improve speed , 2 points are necessary:
1. put page-in request fast
2. request should be in disk order. Especially for a large swap file.
>
> Olaf
next prev parent reply other threads:[~2012-01-07 8:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-05 3:08 [PATCH] xenpaging:add a new array to speed up page-in in xenpaging hongkaixing
2012-01-05 18:27 ` Ian Jackson
2012-01-06 2:35 ` Hongkaixing
2012-01-05 18:31 ` Ian Jackson
2012-01-06 2:35 ` Hongkaixing
2012-01-10 17:39 ` Olaf Hering
2012-01-11 7:15 ` Hongkaixing
2012-01-12 14:20 ` Olaf Hering
2012-01-09 11:50 ` Olaf Hering
2012-01-05 20:59 ` Olaf Hering
2012-01-06 2:35 ` Hongkaixing
2012-01-06 13:07 ` Olaf Hering
2012-01-07 8:55 ` Hongkaixing [this message]
2012-01-09 13:13 ` Olaf Hering
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='002c01cccd1a$279c9a00$76d5ce00$@com' \
--to=hongkaixing@huawei.com \
--cc=bicky.shi@huawei.com \
--cc=hanweidong@huawei.com \
--cc=olaf@aepfle.de \
--cc=xen-devel@lists.xensource.com \
--cc=xiaowei.yang@huawei.com \
--cc=yanqiangjun@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.