Hi Jason, We for sure got lots of benefits with enabling objectmap for mkfs, df, image remove features…… However, we also found IO performance in terms of latency and IOPS when we enable objectmap comparing objectmap disabled. With FIO single job queue depth 1(W/ vs W/O) , IOPS drop 3 times and latency increased 3 times. as with more jobs, the IOPS drops more and latency increase higher and higher. The objectmap_locker in pre and post and objectmap update per IO really hurt performance. Lockless queue and new way to caching objectmap? Any thoughts? Regards, James 本邮件及其附件含有阿里巴巴集团的商业秘密信息，仅限于发送给上面地址中列出的个人和群组，禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制和散发）本邮件及其附件中的信息，如果您错收本邮件，请您立即电话或邮件通知发件人并删除本邮件。 This email and its attachments contain confidential information from Alibaba Group.which is intended only for the person or entity whose address is listed above.Any use of information contained herein in any way(including,but not limited to,total or partial disclosure,reproduction or dissemination)by persons other than the intended recipient(s) is prohibited.If you receive this email in error,please notify the sender by phone or email immediately and delete it. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
