Date: Sat, 02 Jan 2021 21:49:40 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 252358] cp(1) of large files is causing 100% CPU utilization and poor transfer of ~168M/minute Message-ID: <bug-252358-227-ePsxACTi5M@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-252358-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252358 Rick Macklem <rmacklem@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rmacklem@FreeBSD.org --- Comment #1 from Rick Macklem <rmacklem@FreeBSD.org> --- Created attachment 221214 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=221214&action=edit fix the problem by using a large "len" argument for copy_file_range(2) This patch modifies "cp" so that it uses a large "len" argument to copy_file_range(2). This results in far fewer copy_file_range(2) syscalls, each of which will do a SEEK_DATA and SEEK_HOLE. I suspect that these SEEK_DATA/SEEK_HOLE operations are slow for large non-sparse files and doing a large number of them caused the slowdown. -- You are receiving this mail because: You are the assignee for the bug.home | help
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