Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Resend after re-formating the data table. Weilin Gong wrote: > Hi, > > I ran some drbd performance tests with 'tiobench': > > tiobench.pl --identifier drbd-connected --size 5000 --numruns 1 --dir > /secroot --block 4096 --threads 4 > > noticed the huge max latency numbers with Sequential Writes: > > Unit information > ================ > File size = megabytes > Blk Size = bytes > Rate = megabytes per second > CPU% = percentage of CPU used during the test > Latency = milliseconds > Lat% = percent of requests that took longer than X seconds > CPU Eff = Rate divided by CPU% - throughput per cpu load > > Identifier |File Size|Blk Size|Num Thr|Rate |Maximum > CPU%|Avg Latency|Max Latency|Lat % >2s|Lat% >10s| CPU Eff > Raw-device |5000 |4096 |4 |31.24 > |26.80% |0.364 |5635.06 |0.00242 > |0.00000 |117 > Drbd-disconnected|5000 |4096 |4 |33.18 > |26.29% |0.319 |110394.58 |0.00190 > |0.00016 |126 > Drbd-connected |5000 |4096 |4 |20.88 > |50.18% |0.457 |135712.09 |0.00110 |0.0000 > |42 > > My lab setting: > > * Two Linux nodes on 2.6.10_mvlcge401-pc_target-x86_pentium3-P3SMP. > * Dual-core Intel Xeon 2GHz CPU, 4GB Memory, 1Gbits/s network > interface. > * 5.7GB partition on SCSI disk, ext2 file system with the "-T > largefile4" option. > * DRBD version is 0.7.11, rate=100M; protocal C; sndbuf-size 1024k. > > I don't believe the disk (~50MB/s) or network may be the factors here. > You can see the big number jump even with the DRBD disconnected mode. > > Any help on analyzing/identifying the problem will be greatly > appreciated. > > Weilin > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > -------------- next part -------------- A non-text attachment was scrubbed... Name: wgong.vcf Type: text/x-vcard Size: 126 bytes Desc: not available URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20070105/3ac1ffd7/attachment.vcf>