https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-12372 Lustre <p>Currently, OST_MAXREQSIZE is limited to 16 KiB.  This limits the upper size of short i/o (<a href="https://jira.whamcloud.com/browse/LU-1757" title="Short I/O support" class="issue-link" data-issue-key="LU-1757"><del>LU-1757</del></a>) to this size.  This ticket is to examine the implications of growing this limit, to, for example, 64 KiB - The concern is if we end up allocating the larger buffer size all the time for certain operations.</p> <p>Basically, we/I need to examine the code to see if this is the case, and if it's not, we should look at increasing the upper limit, at least to see if it has a positive impact.</p> LU-12372

Look at increasing OST_MAXREQSIZE

Bug Minor Resolved Not a Bug Patrick Farrell Patrick Farrell Fri, 31 May 2019 22:10:43 +0000 Tue, 29 Oct 2019 22:32:29 +0000 Tue, 29 Oct 2019 22:32:29 +0000 0 1 <p>Acutally, <tt>OST_MAXREQSIZE</tt> is only used for the non-IO requests. <tt>OST_IO_MAXREQSIZE</tt> is used for IO requests and calculating <tt>OST_SHORT_IO_SPACE</tt>. It looks like <tt>OST_IO_MAXREQSIZE</tt> is slightly over 64KiB so we <em>should</em> be able to send a full 64KiB short write to the OST. If not, we could adjust it slightly.</p> Related LU-12910 Development Rank 1|i00hdr: Rank (Obsolete) 9223372036854775807 Severity