This is with: # uname -a FreeBSD c720-r368166 13.0-CURRENT FreeBSD 13.0-CURRENT #23 r368166M: Thu Dec 17 13:12:37 CET 2020 guru_at_c720-r368166:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64 I copy often large backup files to an external USB disk and hit the following problem since updating to r368166: A transfer with dd(1) works fast and as expected (~70M / sec): # dd if=guru-20210102.tar.gz of=/mnt/AcerC720/backups/guru-20210102.tar.gz bs=8m 4601+1 records in 4601+1 records out 38603862368 bytes transferred in 506.778929 secs (76174956 bytes/sec) # ls -lh guru-20210102.tar.gz -r-------- 1 root wheel 36G 2 ene. 12:19 guru-20210102.tar.gz When I use cp(1) what I normaly do the transfer is very poor and causes 100% CPU itilization: # cp -p guru-20210102.tar.gz /mnt/AcerC720/backups/xxx ^C killed after 1 minute; transfered in 1 minute: # ls -lh /mnt/AcerC720/backups/xxx -r-------- 1 root wheel 168M 2 ene. 15:34 /mnt/AcerC720/backups/xxx 168*1024*1024/60 = 2936012 bytes/sec ./. 76174956 bytes/sec Trussing the cp(1) process shows these sys calls: # truss -p 37655 copy_file_range(0x3,0x0,0x4,0x0,0x200000,0x0) = 2097152 (0x200000) copy_file_range(0x3,0x0,0x4,0x0,0x200000,0x0) = 2097152 (0x200000) copy_file_range(0x3,0x0,0x4,0x0,0x200000,0x0) = 2097152 (0x200000) copy_file_range(0x3,0x0,0x4,0x0,0x200000,0x0) = 2097152 (0x200000) copy_file_range(0x3,0x0,0x4,0x0,0x200000,0x0) = 2097152 (0x200000) The problem is unrelated to the external disk, also a copy in the local file system shows the same transfer speed of 168M per minute. Is this a known issue or a regressionc ? I see in the man page of copy_file_range(2) that this is new with FreeBSD 13... matthias -- Matthias Apitz, ✉ guru_at_unixarea.de, http://www.unixarea.de/ +49-176-38902045 Public GnuPG key: http://www.unixarea.de/key.pub ¡Con Cuba no te metas! «» Don't mess with Cuba! «» Leg Dich nicht mit Kuba an! http://www.cubadebate.cu/noticias/2020/12/25/en-video-con-cuba-no-te-metas/Received on Sat Jan 02 2021 - 13:59:16 UTC
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