Re: [OpenAFS] AFS Performance / ZFS
Hi Jeffrey, >> Hi, >> >> iam testing a box with FreeNAS (BSD) and ZFS. On this box i use >> virtualized byhve guest as afs server. >> [...] >> Any ideas why afs speed is only about 25 MByte/s ? Maybe i have to >> adjust another afs server parameter ? > There are performance bottlenecks in the byhve network virtualization > that severely impact RX throughput. The weaknesses in the OpenAFS RX > implementation related to flow control, congestion avoidance, and pacing > exacerbate the throughput limitations. Thats an important information. Whats the experience with docker containers (instead of byhve) and OpenAFS ? Andreas ___ OpenAFS-info mailing list OpenAFS-info@openafs.org https://lists.openafs.org/mailman/listinfo/openafs-info
Re: [OpenAFS] AFS Performance / ZFS
On 3/7/2019 9:43 AM, Andreas Ladanyi wrote: > Hi, > > iam testing a box with FreeNAS (BSD) and ZFS. On this box i use > virtualized byhve guest as afs server. > [...] > Any ideas why afs speed is only about 25 MByte/s ? Maybe i have to > adjust another afs server parameter ? There are performance bottlenecks in the byhve network virtualization that severely impact RX throughput. The weaknesses in the OpenAFS RX implementation related to flow control, congestion avoidance, and pacing exacerbate the throughput limitations. AuriStorFS customers use TrueNAS to back vice partitions but do so by exporting the ZFS storage via iSCSI to RHEL7 systems connected to the TrueNAS server with dedicated bonded 10-gbit NICs. This combination is reliable and is capable of filling the iSCSI path. Jeffrey Altman AuriStor, Inc. <> smime.p7s Description: S/MIME Cryptographic Signature
[OpenAFS] AFS Performance / ZFS
Hi, iam testing a box with FreeNAS (BSD) and ZFS. On this box i use virtualized byhve guest as afs server. The box includes SAS drives (12G/s) on HBA (12G/s). I created some vice partitions for the afs server guest and connect them with ahci. If For ZFS pool which contains the vice partitions: - atime and deduplication are off - lz4 compression is on The afs server parameters: - udp size is set to 2MB and 8MB for test - afs sync is set to "never", zfs sync is enabled >From afs client (desktop box, 1GE) to virtual afs server guest there is 1GE ethernet connection. If i test this connection with iperf i get nearly 1GE test data speed. If it test on client side with dd and create a file in the afs path i get about 25 MB/s (200 MBit/s) with memcache and disk cache. if i dd with oflag=direct to the unmounted afs vicepa partition device (/dev/sdX) in the afs server guest system then i get about 1 GBbyte/s which nears to 12 Gbit/s of SAS drive/ HBA speed. Any ideas why afs speed is only about 25 MByte/s ? Maybe i have to adjust another afs server parameter ? Andreas ___ OpenAFS-info mailing list OpenAFS-info@openafs.org https://lists.openafs.org/mailman/listinfo/openafs-info
