On 08/23/12 01:18, Sunil Mushran wrote: > Yes. WRITE_SYNC should be good. Not FUA. > > Also, you may want to look into using io priorities. The code is all > there. Just needs activation. Yes, I'll search the list to find them out.
Thanks, -Jeff > > On Wed, Aug 22, 2012 at 10:13 AM, srinivas eeda > <srinivas.e...@oracle.com <mailto:srinivas.e...@oracle.com>> wrote: > > > On 8/22/2012 7:17 AM, Jie Liu wrote: >> Hi All, >> >> These days, I am investigating an issue regarding OCFS2 >> unexpected reboot in some real world use cases. >> This problem occurred when the network status goes south, when >> the disk IO load is too high, etc... >> I suspect it might caused by ocfs2 fencing if it's BIO >> reading/writing can not be scheduled and processed quickly, or >> something like this happened in the network IO heartbeat thread. >> >> Now am trying to reproduce this problem locally. In the >> meantime, I'd like to ping you guys with some rough ideas >> to improve the disk IO heartbeat to see if they are sounds >> reasonable or not. >> >> 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 >> be preempted by other requests? e.g, for >> o2hb_issue_node_write(), currently, it do bio submission with >> WRITE only, >> 'submit_bio(WRITE, bio)'. If we change the flag to WRITE_SYNC, >> or even submit the request combine with REQ_FUA, >> maybe could get highest priority for disk IO request. > This was submitted before by Noboru Iwamatsu and acked by sunil > and tao but some how didn't get merged > > https://oss.oracle.com/pipermail/ocfs2-devel/2011-December/008438.html >> >> Secondly, the comments for bio allocation at o2hb_setup_one_bio() >> indicates that we can pre-allocate bio instead of >> acquire for each time. But I have not saw any code snippet doing >> such things in kernel. :( >> how about creating a private bio set for each o2hb_region, so >> that we can do allocation out of it? >> maybe it's faster than do allocation from global bio sets. Also, >> does it make sense if creating a memory pool >> on each o2hb_region, so that we can have continuous pages bind to >> those bios? >> >> >> Any comments are appreciated! >> >> Thanks, >> -Jeff >> >> >> >> >> >> >> >> >> _______________________________________________ >> Ocfs2-devel mailing list >> Ocfs2-devel@oss.oracle.com <mailto:Ocfs2-devel@oss.oracle.com> >> https://oss.oracle.com/mailman/listinfo/ocfs2-devel > > _______________________________________________ > Ocfs2-devel mailing list > Ocfs2-devel@oss.oracle.com <mailto:Ocfs2-devel@oss.oracle.com> > https://oss.oracle.com/mailman/listinfo/ocfs2-devel > >
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