eCryptfs

Ecryptfs WRITE performance issue - decryption happening

Bug #1696998 reported by venkatesh akula
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eCryptfs
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Bug Description

Hi All,

We are struggling to speed up ecryptfs WRITE throughput via robocopy on samba. Our linux kernel running on ARM64 server has PAGE_SIZE of 64K.

Linux kernel version is 4.9.0 Wierd thing that we see lot of decryption happening during WRITES.

What should we tune within ecryptfs or else where - to make decryption go away ?

We expect only encryption to happen (mostly) during WRITE throughput tests.

Are there any ecryptfs patches which we can try out.

perf top

    49.50% [kernel] [k] ce_aes_cbc_encrypt
    10.37% [kernel] [k] aes_decrypt_block4x
    9.74% [kernel] [k] arch_cpu_idle
    5.42% [kernel] [k] __pi_memcpy
    3.28% [kernel] [k] ce_aes_cbc_decrypt
    1.62% [kernel] [k] md5_transform
    1.27% [kernel] [k] __arch_copy_from_user
    0.69% [kernel] [k] __pi_memset

This is not functional bug. But please help us understand the behavior why decryption is happening.

Regards
Venkat

Revision history for this message
venkatesh akula (venkatesh.cvm) wrote :

Hello Experts,

Please provide some opinion this WRITE perf problem with ecryptfs.

Appreciate your valuable suggestions.

Regards
Venkat

Revision history for this message
Jason Xing (wlxing) wrote :

Hello,

I use "perf top" to monitor the events when doing copy-command to the mounted directory. But I didn't have the decryption case. Could you provide more information?

Regards,
Jason

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