This is due to the limitation of cachefiles module. If you add flag O_LARGEFILE when dentry_open in cachefiles_write_page function, the problem will be fixed 2011-01-25 guomingyang 发件人： Eric Becker 发送时间： 2011-01-25 03:15:34 收件人： linux-cachefs 抄送： 主题： fscache 2 GB file size limitation I've attempted to benchmark cachefs on an ubuntu 10.04 machine using ext4 on / as the filesystem cache. I've been reading files into memory using cat and redirecting the output to /dev/null. This seems to utilize the cache just fine if the file is <= 2 GB. However, if the file is anything over 2 GB, the cache is completely unused. I'll clear stop cachefilesd, clear out the file system cache (rm -f -r /var/cache/fscache/*), and then restart cachefilesd to make sure there's nothing in it. Then if I cat a 2.1 GB file to /dev/null du shows the /var/cache/fscache dir as a few KB large. If I do the same thing with a 2 GB file du shows the cache as using 2 GB of disk space. Is this expected behavior or is there something I'm overlooking? -Eric -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs
