[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] oo_req, rd_req, wr_req... cant find any docs
On 17/11/2010 19:38, "Shaun Reitan" <mailinglists@xxxxxxxxxxxxxxxx> wrote: > I cannot seam to find any documentation on > /sys/devices/vbd-<domid>-<##>/statistics/ and am trying to figure out > what these stats represent. From the looks of it rd_req means read > requests. Are these read requests that have already been completed? or > can they be requests that are waiting/queued? They count all requests since boot, including those for which processing has not yet completed. Rd_req counts read requests, wr_req counts write requests, oo_req counts the number of times that blkback paused consuming requests because it is out of processing slots (not a massively interesting stat to the user, probably). > What is oo_req, all i can find on it is some comments about them being > mysterious. > > Another doc I found talks about rd_bytes but i don't see that, i do see > rd_sect which i assume is sectors. So is this whats meant for measuring > how much has been transferred (assuming 512 bytes per sector)? Yes an individual read/write request can span a large number of sectors. Rd_sect/wr_sect tells you how much data has actually been transferred. -- Keir > > ~ Shaun > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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