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<div class="moz-cite-prefix">On 08/23/12 01:18, Sunil Mushran wrote:<br>
</div>
<blockquote
cite="mid:CAEeiSHWQMVEPM1113ePCajYFGt-BS84gmLn=03v-_CvUQJ-owQ@mail.gmail.com"
type="cite">Yes. WRITE_SYNC should be good. Not FUA.
<div><br>
</div>
<div>Also, you may want to look into using io priorities. The code
is all there. Just needs activation.<br>
</div>
</blockquote>
Yes, I'll search the list to find them out.<br>
<br>
Thanks,<br>
-Jeff<br>
<blockquote
cite="mid:CAEeiSHWQMVEPM1113ePCajYFGt-BS84gmLn=03v-_CvUQJ-owQ@mail.gmail.com"
type="cite">
<div><br>
<div class="gmail_quote">On Wed, Aug 22, 2012 at 10:13 AM,
srinivas eeda <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:srinivas.eeda@oracle.com" target="_blank">srinivas.eeda@oracle.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div class="im"> <br>
On 8/22/2012 7:17 AM, Jie Liu wrote:
<blockquote type="cite"> Hi All,<br>
<br>
These days, I am investigating an issue regarding
OCFS2 unexpected reboot in some real world use cases.<br>
This problem occurred when the network status goes
south, when the disk IO load is too high, etc...<br>
I suspect it might caused by ocfs2 fencing if it's BIO
reading/writing can not be scheduled and processed
quickly, or<br>
something like this happened in the network IO
heartbeat thread.<br>
<br>
Now am trying to reproduce this problem locally. In
the meantime, I'd like to ping you guys with some
rough ideas<br>
to improve the disk IO heartbeat to see if they are
sounds reasonable or not.<br>
<br>
Firstly, if an OCFS2 node is suffer from heavy disk
IO, how about to fix the bio read/write to make this
IO request can not<br>
be preempted by other requests? e.g, for <span
style="margin-right:0"><span></span></span>o2hb_issue_node_write(),
currently, it do bio submission with WRITE only,<br>
'submit_bio(WRITE, bio)'. If we change the flag to
WRITE_SYNC, or even submit the request combine with
REQ_FUA,<br>
maybe could get highest priority for disk IO request.<br>
</blockquote>
</div>
This was submitted before by Noboru Iwamatsu and acked by
sunil and tao but some how didn't get merged<br>
<br>
<a moz-do-not-send="true"
href="https://oss.oracle.com/pipermail/ocfs2-devel/2011-December/008438.html"
target="_blank">https://oss.oracle.com/pipermail/ocfs2-devel/2011-December/008438.html</a><br>
<blockquote type="cite">
<div class="im"> <br>
Secondly, the comments for bio allocation at
o2hb_setup_one_bio() indicates that we can
pre-allocate bio instead of<br>
acquire for each time. But I have not saw any code
snippet doing such things in kernel. :(<br>
how about creating a private bio set for each
o2hb_region, so that we can do allocation out of it? <br>
maybe it's faster than do allocation from global bio
sets. Also, does it make sense if creating a memory
pool<br>
on each o2hb_region, so that we can have continuous
pages bind to those bios?<br>
<br>
<br>
Any comments are appreciated!<br>
<br>
Thanks,<br>
-Jeff<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<fieldset></fieldset>
<br>
</div>
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