On 08/02/19 07:12, Matteo Croce wrote: > Hi, > > latest gnulib have support for sendfile and AF_ALG, the kernel crypto > framework, if compiled with --with-linux-crypto. > This allows to have very fast hashing algorythms but without the > libcrypto dependency, > > coreutils$ ./configure --with-linux-crypto > [...] > checking whether linux/if_alg.h has struct sockaddr_alg.... yes > [...] > > coreutils$ ldd src/sha1sum /usr/bin/sha1sum > src/sha1sum: > linux-vdso.so.1 (0x00007fff1d56b000) > libc.so.6 => /lib64/libc.so.6 (0x00007f156b70c000) > /lib64/ld-linux-x86-64.so.2 (0x00007f156b902000) > /usr/bin/sha1sum: > linux-vdso.so.1 (0x00007ffebef02000) > libcrypto.so.1.1 => /lib64/libcrypto.so.1.1 (0x00007fe977d09000) > libc.so.6 => /lib64/libc.so.6 (0x00007fe977b43000) > libz.so.1 => /lib64/libz.so.1 (0x00007fe977b29000) > libdl.so.2 => /lib64/libdl.so.2 (0x00007fe977b23000) > libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fe977b01000) > /lib64/ld-linux-x86-64.so.2 (0x00007fe978020000) > > coreutils$ time /usr/bin/sha1sum zero > 2a492f15396a6768bcbca016993f4b4c8b0b5307 zero > > real 0m1,254s > user 0m1,147s > sys 0m0,108s > coreutils$ truncate -s1g zero > coreutils$ time src/sha1sum zero > 2a492f15396a6768bcbca016993f4b4c8b0b5307 zero > > real 0m1,234s > user 0m0,005s > sys 0m1,230s > > Think about enabling it.
Depending on which kernel is used this can also be significantly slower. Enabling this by default should be very carefully considered as per the reasons detailed at: https://lists.gnu.org/archive/html/coreutils/2018-06/msg00034.html BTW openssl 3 is relicensed, so debian should be in a position to enable use of libcrypto routines then. cheers, Pádraig
