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if the reported value goes above 2093056, clients crash due to readv having iovcnt &gt; 1024.
The original value of 1022 * page size of 4096 generated dlen of 4186112. These were then resolved client side in XrdCl/XrdClAsyncPageReader.hh to ::readv calls of iovcnt 2044, triggering the einval error. 

fix for #1740 
You can view, comment on, or merge this pull request online at:

  https://github.com/xrootd/xrootd/pull/1749

-- Commit Summary --

  * reduce maxCSSZ to avoid readv EINVAL error

-- File Changes --

    M src/XrdXrootd/XrdXrootdXeqPgrw.cc (2)

-- Patch Links --

https://github.com/xrootd/xrootd/pull/1749.patch
https://github.com/xrootd/xrootd/pull/1749.diff

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